Most times I'll spend 10-20 on a game, unless I can find it cheaper.
There are a few games that I'll shell the full amount for though. Examples from the past year would be F-Zero GX, Viewtiful Joe, Harvest Moon, TopSpin Tennis, and Ultimate Muscle.
I guess it just depends on how excited I am for a game.
Still debating on Riddick. Want to see some more reviews besides IGN.
And I'm always looking at my backlog of games and wondering if its smart to buy new ones.
I've still only played Steel Battalion 3 times now. Assembling that controller can be quite the task.