Depends. I usually do not purchase games upon their release date. Doom 3 should cost about 62 euro’s when new, but i rather buy it 2nd hand or just wait for next year.
This also servers another purpose ; Not wanting to purchase a new motherboard and vga card every year.
I have just bought and recieved 2nd hand versions of Midnight Club 2 , Burnout 2 and Wolfenstein for my Xbox , each game costed me just 20 euro’s instead of 59,59 a piece new. Last year i bought the complete works of Half Life (Half Life , Counterstrike , Opposing Force and Blue Shift) for a total of 15 euro’s.
One exception last year was Broken Sword III , i just had to get that game (45 euro’s !).
This year i have bought about 15 games for my xbox , about 1 for the pc.
Last year i didn’t own a xbox yet , so i just bought about 4 or so games.
Being a game reviewer is also quite beneficial ; I never have to buy the games i review and with luck i’m usually one of the first people to get the game (or preview code) . For instance : I already have Colin McRae 2005