Perhaps eBay's attempts at empowering buyers so they feel confident in coming to eBay to bid/purchase has gone a little too far .... that they now feel so empowered, that they are comfortable to ignore the sellers' terms and conditions as well as their 'commitment' to buy - a reminder of which still pops up when they have to hit the 'confirm' button.
Now, eBay being eBay, their answer is typical ... push the burden of this onto the sellers. After all, eBay is just one entity and there are just so many more sellers............
Plus the fact that sellers will be scrabbling to maintain patronage by any means possible just to keep their head above water - which will assure fee revenue - why should eBay worry about such details?
One can only wish that eBay would stop shooting holes in the bottom of the boat while the sellers are trying to keep the thing afloat.
That's the good thing about having your own website - you are responsible for it, but you also have the power to do something about it! (Now - what price are SSL's running at these days.....?)