That's an ... interesting method. But hey, whatever works.
It's better than my system. I'll go to pawn shops and buy whatever I see. Doesn't really matter if it's what I'm looking for, or even if it's a particularly good deal. It's kind of like, hey I don't have that, and it's not a football/baseball/hockey game, so I "need" it. Need, yeah right
My best method of controlling myself is my wife. She's not a bitch or anything, but she's not into collecting stuff as much as I am. So for instance, yesterday I was convinced I wanted a GB Micro. We already have a Gameboy Advance, Gameboy Advance SP, Gameboy Player, and Nintendo DS. Why on Earth do I need a Micro? I don't. So she said that since it's kind of an expensive purchase, why don't you wait a couple of days and see if you still want it, if you do we'll get it then.
Great idea, because today I don't really want one anymore. Unless I see one cheap, then I'll get it just for completeness sake.