Some fun numbers just for the fuck of it. These numbers are based on current leaderboards.... So yeah, take it for what it is worth. Which is not much
Castle Crashers 3.79 million..
World of Kelflings 1.27 million
Banjo K 400k
Castle storm 66k
Catan 244k
Crash Course 2 3.3 million (free to play)
Duck tails 50,190
Far cry Blood Dragon 430k
From Dust 160k
Doom 2 251k
Geometry Wars 1.2 million
Geometry Wars 2 720k
Grip shift 22k plus
30 half minute hero 44,119
Hydro thunder 422,167
Ilomilo 76,425
Lara Croft 306,640 (just became free with gold a couple of days ago)
Minecraft. Peaceful 9,544,786. Easy 11,532,656 Normal 7,012,300. Hard 5,552,516
Monkey Island 2 70,469
Motocross Madness 440,904
NBA jam oh shit the game is broken and killed my 360
Peggle 1.3 millionish
Perfect Dark 510,820
Phantasy Star 2 25,582
Pinball FX2 250kish ... Hard to say
Poker Smash 90k
Puzzle Fighter 2 shit it reset. No way of knowing
Retro city rampage 24,752
Rez HD 49k
Sega Bass Fishing 114,951
Shadow Complex 641,903
Sonic Adventure 398,357
Sonic 3 252,368
State of Decay 1,092,230
Terraria 671,278
The Dishwasher Dead Sam.... 97kish
The Simpsons 87,409
TMNT Classic Arcade 1,036,349
Toy Soldiers 755,915
Toy Soldiers 2 Cold War 459,229
TMNT Turtles in Time 474,466
UMK3 (no longer available) 244,503 This leaderboard is only online ranked matches, so actual sales are maybe much higher.
Uno Rush 114,030 not to be confused with UNO which is in the millions
Yaris Free to play 546k
Zumas Revenge 90,961
http://www.neogaf.com/forum/showpost.php?p=97549031&postcount=5894