I did one of these
last year and I'm glad I did because its allowed me to see just how much stuff I accumulated this past year. So, I'm going to do it again so I can see what all I bought in 2010 come 2011.
Here is my current collection numbers, they may not be exact (with 2000+ games it is sometimes hard to remember to add or delete a couple games) but it should be pretty close, and this is what I use as my "official" count of games at the end of my Treasure Hunt Chronicles posts.
NES - 542 total, 384 unique
SNES - 208 total, 171 unique
N64 - 134 total, 104 unique
GameCube - 42 total, 42 unique
Game Boy Color - 25 total, 24 unique
Game Boy Advance - 13 total, 12 unique
Sega Genesis - 317 total, 243 unique
Atari 2600 - 212 total, 184 unique
PlayStation 1 - 315 total, 254 unique
Dreamcast - 53 total, 45 unique
TI-99/4A - 16 total, 15 unique
PlayStation 2 - 118 total, 114 unique
GameGear - 14 total, 11 unique
Odyssey^2 - 1 total, 1 unique
Sega CD - 40 total, 33 unique
Saturn - 25 total, 25 unique
Atari 7800 - 3 total, 3 unique
GameBoy - 22 total, 21 unique
Master System - 34 total, 33 unique
Sega 32X - 3 total, 3 unique
Game.com - 4 total 4 unique
Tiger Quiz Whiz - 2 total, 2 unique
Xbox - 71 total, 68 unique
Intellivision - 19 total, 17 unique
3DO - 18 total, 18 unique
ColecoVision - 11 total, 11 unique
Wii - 7 total, 7 unique
TurboGrafx 16 - 32 total, 32 unique
Atari 400 - 11 total, 11 unique
Xbox 360 - 9 total, 9 unique
Nintendo DS - 4 total, 4 unique
Commodore Vic-20 - 5 total, 5 unique
Sega Pico - 6 total, 6 unique
Atari 5200 - 3 total, 3 unique
Totals:
Total games: 2,339 (417 more than last year)
Total unique games: 1,919 (441 more than last year)
Total spent on games, systems, accessories, etc: $742.21
Total spent plus shipping costs for trades: $824.86
Total amount sold: $586.19
Total "loss": $238.67
Average price paid per new unique game: $0.54 (calculated by total amount spent minus total amount sold divided by total unique games bought).
Now to just wait and see what 2010 will bring for my collection