It works fine for eBay ...
What's the fuss? eBay have been doing this since 2008. Years earlier Pierre Omidyar felt it was a great idea to invite feedback (and it was), but one day they woke up with a brilliant idea... BAN negative feedback! Who needs all this negativity the marketeers decided. Buyers are eBay's product, and these 'products' should only receive +ve ratings... eBay's products are just great now...
Biting the hand that feeds IT
