You know, its sad that these kinds of things happen but as long as there are generous people out there creating these things for free-there will be crooks out there to take advantage of that. Unfortunately, thats the way the work works and there's really nothing that can be done about it. Even you if managed to take one down, another would take his place.
But, for kicks I decided to look through his feedback at previous auctions he had-and there are a bunch like this one. Several people have left negative feedback stating that he sells illegal copies of freeware but he continues. One of the most interesting things I saw him say on one of his auctions was:
"*Please Note: if you want any FlightSim planes email me a list to [his e-mail] and if I own the plane I'll make you back thanx*"So, basically if you want something e-mail him and he'll search the freeware websites and if he finds it you can buy it from him because he "owns" it. :-/
See for yourself, he posted it on this auction which ended back in February:
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&category=11051&item=8263094765