Just an idea, but why doesn't an auction house try to have a photo-matched only auction. (I know it does not mean item is the one in the photo- so there could be bad items, but the odds would be better for the buyers.) Auction house could check tagging.
Would be an awsome catalog to check out and would create a buzz for sure.
Not saying it will ever happen, but when there are great matched items to sell and money to be made by the auction house and seller, why not.

Better than the "seller says it was game used" lines we get now.