Oh yes, I most certainly do! I'd almost go as far as to call myself a pack-rat, but shh, don't tell my sanity that
I... actually forgot to mention several of my past collections, now that I think about it. I have a sizable collection of Harry Potter cards that I forgot about, for instance. And I have a bunch of posters stashed away somewhere. And baseball, basketball, football, and hockey cards.
... Oh dear, I really am a pack rat, aren't I?