From eBay via scary spam email with my real name plastered all over it:

Buying and selling on eBay made even safer

Starting in late April, eBay will now ask all sellers to offer PayPal on their listings. This means that even more items on eBay will offer buyer protection.

This is one of many new initiatives that eBay and PayPal are doing to make it much more difficult for bad sellers to operate on eBay. As a result, you'll notice a dramatic improvement in quality when buying on eBay.

It's just another example of the trade-off that's seemingly and irritatingingly necessary in this world between customer choice stroke seller's free will and security in capitalism. sigh