I honestly store a lot of my bulkier stuff at my mom's place. She's got tons of basement/attic space, and I have NO space.
I just moved into a small 1-bedroom apt from a house I was renting. MUCH less space. I'm consolidating my collection a bit, getting rid of some of the crap I never use in favor of a more concentrated "players" collection rather than, say, a "collectors" collection, if that makes any sense.
I'll still buy up everything I come across, but mainly to resell or trade for things I really want. For instance, I'd buy up 40 Genny games or whatever, but then trade them for one or two things I really want.