Though spammers and scammers are easy to identify it's sometimes difficult to get them banned, feels like the mods don't agree. Here a mod even joined in and posted, but neglected to '86 the scammer.
Eventually another infrequent poster with WTB ad will get taken.
Sample from the engine building forum:
http://forums.pelicanparts.com/911-engine-rebuilding-forum/1130648-engine.html