I used to be a huuuge fan of eBay, but over the last few years their never-ending stream of continual price hikes have put me off them.
The last straw was when they changed their Paypal rules. In order to accept Paypal payments you have to agree to:
1) Accept Credit Card payments (=extra fees).
2) Upgrade your account (=monthly fees)
They also refuse to accept Google Checkout, citing security concerns due to a lack of a track record. I wonder how long they will keep up that charade.
Oh, and if you are a seller and someone uses a stolen credit card to pay you, watch out. Paypal will lock your bank account for 180 days with no recourse. And this is your fault HOW???
For the small sellers that built eBay, this is too much. I have watched them leave, replaced by "megasellers" offering new items at slightly below retail. I have cut back my eBay use markedly, and stopped accepting Paypal entirely.
Bottom line: Like Microsoft, eBay have become a de facto monopoly, and they have acquired the arrogance that goes with it. They need some competition - an AMD to their Intel, if you will - to keep them honest.