This is a great idea, but...

One of the big problem with many of the eBay auctions is that they don't use original material - for example, if you're selling a copy of a game or movie, often you won't bother to take a picture of your copy - you'll search online and find the best one you can, slap it in the auction and call it a day.

This happens all the time, and as auctions are very time limited, it often doesn't raise the ire of the original source of the media.

If they had some sort of dedupe/anti-"stock photo"/anti-"professional product shot" thing in there, this could probably work.