Well maybe that works in your country with those fake comments, but not in mine.
I'm able to see:
- each person who has bought something from that user
- what they have bought (if auction is not older than 1 month)
- what comment they have wrote
- i'm able to enter those persons profiles and check what other things they buy, sell, what time, what price, their ratings etc.
So i don't think a scammer would create thousand of fake accounts and make them active and buy diapers on them and other things