While buying lots can be a good way to get great deals on stuff you want, I wouldn't be too concerned with the idea of "bulking up". Just pursue what you want. Unless you have a ton of space, you may hit a day like myself with my 1200+ games where you have to think about if a purchase is worth the trouble of finding a place for it. Sure, you could weed out the junk later if you wanted, but it's better to save yourself the trouble.