Interesting question... one that im afraid to find out the answer to... but here goes nothing... (Money in U.S. Dollars)
Nintendo World with Wiimote $50
Mario Kart 8 $50
Bravely Default $40
Pokemon Platinum $50
Pokemon White $30
Pokemon White 2 $20
Pokemon X $40
Final Fantasy: The 4 Heroes of Light $20
Still debating if I bought Pokemon Soulsilver this year... if I did... thats $40
Galaga for 3ds VC $5
Game and Watch Gallery for 3ds VC $4
A Link to the Past for Wii U $1.25
EDIT: Devil May Cry HD Collection $20
Action Replay for DSi $30
$400.25 US Dollars this year so far... Not bad.. though last year was REALLY EXPENSIVE (Wii U, 3ds XL + games)
Games I'm still going to buy:
Bayonetta 2
Pokemon AlphaSapphire
Zelda Hyrule Warriors
Super Smash Bros Wii U