Why do we keep coming back?

Simple really. We gotta catch them all!

Jokes aside, it's actually quite true, I think. There's that little piece of our souls that obsesses about collecting stuff. You know, the you that collects seashells, stamps, maybe press flowers. Purchasing DVD box sets and lining 'em up in your living room. Making your jigsaw puzzles... Getting those comics where that one volume is horrendous but you just have to complete your collection.

... or I could just be talking about me XD