I haven't really searched for many watches on ebay so cant speak to the reps on there but I can tell you that "replica" clothing is ALL OVER ebay and they do nothing about it that I can see. I had bought a couple of shirts about 2 years ago before I even knew that the whole rep world existed, when I got them, they didnt seem right but couldnt put my finger on it. They were cut funny and shrunk after 2 washes to the point where I wouldnt wear them anymore.
I know now that these had to be reps and now when I run the same searches, and know about the rep world, it is obvious, the "tells" on what is rep and what is real. Ebay HAS to know what is going on here and with the feedback ratings on some of those sellers being in the 100s or 1000s, they turn their head.
I didnt realize that it was as prevalent in the watch rep world though....If people know they are buying reps, thats one thing but people passing off $10000 watches as gen needs to be addressed.