To be fair, he's probably only been singled out because he is a regular seller of Lexus LS models, and as such has often been linked to by new members who want advice on one of his cars.
You're right though, there are loads like him who make low bids on lots of cars, knowing that some will accept his bid through ignorance, or sometimes because they can't be bothered to go through the normal selling process.
When he bids low like that he has already spoiled your auction. As for singling him out, this is a Lexus forum and he sells almost always Lexus LSs so anyone who comes across as dodgy as lexuschap is immediately going to be posted to warn your fellow members and friends. lexuschap has put himself into this position let no one run away with the idea that this guy is being persecuted. One day he will get his just deserts as all his type do. Mike.