@tobiasd4, 

Sellers being unable to leave negative feedback for buyers might be something else eBay should think about, so perhaps you've raised another valid shortcoming of feedback on eBay. 

As it stands, the title says "About this seller". Directly beneath that (under the seller name) it reads "100% feeback". Experienced eBay users may have learned that it relates to feedback as a buyer, but it should specify which it is. Under this title, it's a contradiction when just to the right it says "No feedback received".