I agree with you..there is something I don't trust about ebay. Also they only have the authority over you that you give them. I know we agree to the terms and conditions with anyone online, however enforcing them at times could be a problem for them if you were not trying to hurt them.
My husband just bought something through a place called CoParts instead of Ebay.. It seems any place online also tries to get all they can out of a deal.
There are people who have based their entire livelihood on selling via Ebay, so while that was their own choice - it is going to be a big problem for them to move away from Ebay if Ebay attempts to enforce their policies. Additionally, they claim to be able to levy fees for breaking their new rules, so that could possibly include the seizing of money being used to buy/sell goods.. I'm not 100% clear on how far they can go with that - but I can foresee the possibility of court cases coming from this!