1) Eb@y resulted in large amounts of spam for this board. People sticking their stupid auctions in Hot Deals / For Sale/Trade forums.
2) Many sellers, such as those of Playstation 2 units, are viewed as greedy vicious Ferengi who have made getting "the" toy for christmas not a question of IF you can get it, but how MUCH are you willing to pay for it.
Example: My co-worker last year fought on a bid a week before christmas for that stupid PokeMon gameboy thing.. paid over $300 for a friggin gameboy... so his daughter could have the one present she REALLY wanted.
3) Eb@y for the longest time would not protect people at all. Even now, there are tons of shill bidders (people creating 2nd accounts to bid up their own items), and frauds. Eb@y takes a very non-commital attitude and makes it take a LONG time to get any restitution.
4) Stupid bidders. I sell things on there all the time, specifying US ONLY and my shipping method. Undoubtedly, about every 3rd or 4th auction, I get some dumbass from Canada who doesn't think canada is international, or who wants me to ship something other than Airborne Express.
Look, my rules are my rules, don't like it, dont bid. If you want to ASK me to bend the rules, ask BEFOREHAND not after its over.