The only logical conclusion that can be made from eBay's and Paypal's policies is that they no longer want small sellers to use them. They want professional sellers to sell from their site, people who are used to dealing with chargebacks, etc, and can foot the bill when it comes to chargebacks/fraud. They want to facilitate BUYING from regular people, but make SELLING by regular people very difficult.

There is no other explanation for getting rid of buyer reputation and providing no protection to sellers. They only want people who don't care about buyer reputation, and have deep enough pockets and the expectation that chargebacks and fraud will occur. If they deal with these larger customers, this increases their selling volume (and fees) and decreases their support costs.