Okay, so maybe you don't have to like action figures if you're a comic fan, but why wouldn't you? For my money, there's something indescribably cool about having a physical representation of the characters you like. Then again, I'm not the sort to spent more than $20 on a toy, and frankly the $20 ones have to really appeal to me.
Also, for the record, they are toys to me, not collectibles, and I open them as soon as I get back to my house. I can't really fathom hunting around for just the one you wanted then leaving it on a shelf, unopened, unappreciated. For example, earlier today I finally found a 25th Anniversary G.I.Joe Destro; something I've wanted for nigh on four months now. He makes a nice addition to my desktop. It's great to be a toy fan for the sake of their aesthetic purpose, but more importantly, it lets me keep a collection of the characters I really enjoy.