i think it would probably suck to be a seller on ebay, but i buy computer hardware/parts off of there probably 5-10 times per week, and i really love it. thank god for it. i don't know where else i'd buy some of this shit if ebay didn't exist.
I'm not a big time seller by any means but selling is a real pain in the ass sometimes. Roughly 1/4 of my completed auctions are a hassle. When someone doesn't pay it takes at least a week to get refunded the final value fee. I've had stuff lying around for several months straight due to repeaded buyers not paying. The real bad part is that ebay changed the way feedback works so I can't even warn future sellers about these people. It's impossible for me to leave feedback on buyers who don't pay.
On the positive side, ebay is the only place I would ever get rid of most of my junk. Without it I would just throw most of it out so the hassle is worth it for me.
My contribution to things which annoy me: I just read an article which informed me that the SOPA bill in congress has bipartisan support. Of all the important issues in our country this is the one which they will cooperate on. I think I just puked a little.