I agree with you. Only today, as a buyer, I had a close shave while looking for an airflow sensor for my car; the potential seller was implying that his sensors were made by Bosch, they're not. After looking at his feedback from buyers, he's just selling plain white-boxed products as I suspected - in spite of the 'sample' pictures with Bosch boxes that, in my opinion, he uses to mislead buyers.

Some of the revealing comments weren't even negatives. If I'd have read a negative like "doesn't fit my car" then I'd have assumed the buyer was negligent in buying the wrong item - I think most of us can see past the stupid ones left out of ignorance.

A careful reader won't believe everything he/she reads on eBay's feedback but I feel confident in saying that with its help you can spot something bad, as long as its been bad for a little while.