$800 - PC - Including what I payed for the older parts when I bought them.
$430 - Wii + Zelda + Wii Sports + Nunchuk x 2 + Wiimote (my number might be off here its been a long while but i think thats about right)

FREE - Elebits
FREE - Madden '07
FREE - Metroid - The 3 free games were gifts, metroid was actually an IOU from X-mas lmao. Weird setup I know.
$50 - Super Paper Mario
$50 - Wii Play

$50 - Bioshock
$30 - Brothers In Arms X2 versions
FREE - Dark Messiah (Came with Video Card)
FREE - Supreme Commander (Came with Video Card)
$50 - NWN2
$50 - Oblivion
$30 - HL2 & Ep1 (iirc)
$30 - UT2k4
$50 - Overlord


Note: I included some older games but only ones I still play.

Total Cost = $1,620
Wii Games = 7
PC Games = 10
Total Games = 18
Cost Per Game = $90

Edit: Breaking it down farther

Cost Per Game (Wii) = $75.71
Cost Per Game (PC) = $109.00

After these holidays the numbers will be more like this:
Total Cost = $1,950
Wii Games = 10
PC Games = 17
Total Games = 27
Cost Per Game = $72.22

Cost Per Game (Wii) = $68.00
Cost Per Game (PC) = $77.64 

Orange Box is gonna help with that so much! (technically black box but whatever).

Xbox 360 - $350
Xbox 360 Controller - $40
Hexic HD - Free
Aegis Wing - Free
Forza Motorsport - $8
Prince of Persia: Sands of Time - $8
Project Gotham Racing - $3
Project Gotham Racing 2 - $3

TOTAL COST - $412

TOTAL GAMES - 6

$/Game - $68.66

But I didn't buy my 360 just for games; I also use it as a Media Center Extender (which cost $80 for the original Xbox). With this factored in:

TOTAL COST - $332

TOTAL GAMES - 6

$/Game - $55.33

And it's going down... (I don't buy new games)

I would just have to guess and say $30-35. I buy a lot of budget and used stuff because I hate paying 50 or 60 bucks for a game. I look for sales, discounts, coupons, etc. and use them to get what I want -- carefully. About twice a year, Gamestop runs a "buy two get one free" on used games. The last time they did, I bought about 12 (used) current run games for my 360. 54.99 used on the 59.99 titles minus 10% club member meant I paid 100 bucks for three 59.99 titles (used, of course) divided by 3 or $33 per game. I'm at the end of that list of games, though and I need another sale, lol.

I'm not adding systems, accessories, and VC/Live games because part I just don't want to and the other part I can't remember. Also only listing games within the last year.

The Legend of Zelda: Twilight Princess: $50
Super Paper Mario: $50
Marvel Ultimate Alliance: Free
Red Steel: Free
Dragonball Z: Budokai Tenkaichi 2: $50
RE4: $25
Harry Potter and the Order of the Phoenix: $50
Big Brain Academy: Wii Degree: $40
Elebits: $40
Metroid Prime 3: Corruption: $50
Excite Truck: $40
Brain Age 2: More Training in Just Minutes a Day: $20
Planet Puzzle Leage: $30
Puzzle Quest: $30
Bioshock: $50
NCAA 08: $60
NCAA 07: $60
Dead Rising: $60
Gears of War: $60
Kameo: $25
Ninety-Nine nights: $20
FEAR (360): $40
Shadowrun: $60
Crackdown: $60
Guitar Hero II: $80
Tetris Evolution: $40
Tomb Raider: Legend: $40
Odin Sphere: $50
Blood Rayne II: $40
Aeon Flux: $30

Total Cost: 1250
Average: $41.67 per game

. €250: Wii + Wii Sports
.   €50: Wii Play
.   €50: Strikers
.   €45: Zelda
.   €20: Nunchuck
.   €20: Classic Controler
.     €6: Bomberman 93
.     €8: SMW
. €450: Total
.   €75: per game

All prices include tax and shipping when applicable. Goozex prices are converted at 20 points = $1. I'm not including VC games, because they're valued so differently from retail games.

. $271.86: Bought Wii
.   $76.10: Bought Wii Play and Nunchuck
.   $30.00: Bought Wario Ware: Smooth Moves used via gametz.com
.   $25.00: Bought Rayman Raving Rabbids used via gametz.com
.  -$21.97: Sold Wii Play used via gametz.com
.   $30.00: Bought Elebits used via gametz.com
.  -$32.27: Sold Wario Ware: Smooth Moves used via gametz.com
.   $38.50: Traded for Trauma Center: Second Opinion used via goozex.com
.  -$37.27: Traded away Elebits used via goozex.com
.   $41.00: Traded for Mario Strikers: Charged via goozex.com

. $420.95 total
.   $70.16 per game

Purchased:
Xbox 360 Premium $350
Madden NFL 08 $60
Gears of War $55

Exchanged Gears of War, Xbox 360 Premium for 360 Elite
Gears of War $50+Xbox 360 Premium $350+Out of pocket $50=Elite $450
Fable $10

Good Lord, do you realize how long it would take me to compile those exact numbers with what I own? Not only that I'd have to factor in what doubles/games I've sold on E-bay.
I'll give it a shot though; mind you this is extremely rough.

NES Systems: Own 5 total cost $60-----------#sold 1@ $150------Net -$90
NES Games: 300+ Total cost around $100------# Sold 5 @$50----Net -$40

SNES Systems: Own 3 Cost $150-------#sold 3 $150-----Net -$40
SNES Games: Own 21 Cost $160------#Sold 10 $180----Net -$60

Genesis Systems: Own 1 Cost $3------ #sold 0-------------Net -$60
Genesis Games: Own 8 Cost $20-----# Sold 3 $70----- Net -$120

Plastation System: Own 0 Cost $5------Sold 1 $30-------- Net -$145
Playstation Games: Own 0 Cost $10---Sold 3 $75--------Net -$210

Nintendo 64 Systems Own 4 Cost $30---Sold 2 $200-----Net -$390
N64 games-------------Own 4 cost $40----Sold 2 $60------Net -$410

Gamecube System---Own 0 Cost $210----Sold 2 $200-----Net -$400
Gamcube Games:----Own 7 Cost $50------Sold 3 $90 ----- Net -$440

Xbox System-----Own 1 Cost $150--------- Sold 0 -----------Net -$290
Xbox Games------Own 8 Cost $100--------- sold 0 -----------Net -$190

Playstation 2 Systems----Own 0 Cost $150----Sold 1 $70---Net -$110
Playstation 2 games------Own 1 Cost $70----- Sodl 3 $10---Net -$50

Wii System----- Own 1 Cost $270------Sold 0------------------Net +$220
Wii games------ Own 7 Cost $200------Sold 0-----------------Net +$420
Wii Accessories--Own 4 cost $100------ Sold 0----------------Net +$520

Miscellanous Sales (Strategy Guides) Cost $5 Sold 3 $80--Net +$455

To clarify numbers some systems sold included games but they were not tallied in the games section. The games section only consists of individual games sold. Also these are very rough numbers but likely undercalculated because I did it from memory which means I probably left some sales out and neglected a couple purchases.

I've spent $535 on gaming in the last 2 years and own roughly 400 games (proabably slightly more, I ve games for sale I didn't include in my totals)
that puts my average per game @ 1.14

EDIT: Obviously if you went by stirctly how much I have spent without including the games I've sold I would be in the thousands of dollars. i only included the sales because the money I earned usually went back into my gaming hobby.  Also, if I hand't bought the Wii I'd be in the Negative dollars per game. :)

I have a wii.

Can I include gamecube games I bought since getting the wii?

This is the list of games i've purshased this year so far 

1. Bioshock = 51
2. Gears of War = 9
3 Crackdown = 9
4 Viva Pinata = 9
5. Dead Rising - 24
6. Ghost Recon: Advanced Warfare 1 - 21
7. Call of Duty 2 - 24
8. Oblivion - 25
9. Halo - 8
10. Halo 2 - 9
11. Fable - 8
12. Persona 3 - 41
13. Odin Sphere - 35
14. Blue Dragon - 51
15. Fatal Fury Archives vol 1 - 10

16. Final Fantasy 12 - 23

17. Rogue Galaxy - 22

18. Disgaea 2 - 25

19. Final Fantay 7: DoC - 17

20. Guitar Hero 80s - 35

21. Star Fox Assault - 8

22. Tales of Symphonia (my 2nd copy) - 8

23. Paper Mario Thousand Year Door - 8

24. Baten Kaitos Origins - 15

25. Tales of the Abyss - 25

Total = $520

Average = 20.8

All my Games are Brand New.. i somehow don't like buyin Used Games... unless a super rare RPG in decent condition for a reasonable price