I hope you mean buyers? Sellers are the bottom on the barrel for eBay and it's really just going to get worse.
My question on this whole thing - What if you are upfront about some "un-authentic" things on a watch and someone still wants to buy it as a parts piece or repair to original? You sell a watch and clearly call out the defect or changes.
Or what about watches that are literally a pile of parts but still worth well above $2,000?
Or, That CK2998 that someone reprinted the dial and swapped a bezel for something aftermarket... is that going to be confiscated by this random dude?
I understand this probably more geared towards someone buying their first new Rolex on eBay and not wanting to get scammed with a replica. But there should be a checkbox or something that says "This is not being sold as 100% correct" and have the buyer agree to that before completing the purchase.