honestly it really ranges from about 1, to PERHAPS 3 tops...even though I can more than afford to do more.
I don't buy many simply because Once I tend to beat a game, I don't touch it again unless it has a really high replay value ( meaning in that case that it A: has alot of content released. B: has multiple endings, or options to alter the gameplay and story.
Most games...like Assassins creed I loved, but buying it was a waste, as after I finished it I just could not bring myself to play more than once... same with bioshock, Gears, and a few others.
so that said I just use gamefly for 90% of the games I want to play...and there are a few that make it out to where I want to buy...but those are ones I've played and know they have something that offers me a reason to replay it alot... Like Mass Effect, or ones My kids play alot, so I buy those for them.
the way I look at it. IF I blew the $50-$60 bucks on a game, beat it in a day or two, and just leave it to collect dust, I'm wasting major money by the end of the year, and trade value sucks...
so by going the path of gamefly, then buying used from them, OR gamestop, hastings etc on games I've tested for repeatability, I save alot.