Anecdote about eBay, I sold an iPad on the site about 3 years ago, it got bought "Buy it Now" 3 times in a row from fraudsters even after restricting countries and ratings ppl just refused to acutal pay for the goods.

However after one "Free" re-listing ebay demanded that I pay them, even though the item had not sold. So in effect ebay has created an economic model where they benefit from scammers and fraudsters.

I never sold anything on the site again.