I tend to have a weird approach to music collection.
See, I tend to have a problem in that if I like a group, I tend to prefer to collect every single album they've ever released. Which is pretty much the complete reversal of the singles-centric electronica lifestyle. And since I don't go clubbing or hang out with DJs, I don't always know what's worth grabbing from the record store.
So I've ended up with a lot of fairly out-there music because I'll buy the lesser-known albums after the flash-in-a-pan popularity has burned out.