there have been many people attempting to make a list of people who scam... change your nick and all of the sudden you are a new player who "never scammed".
by advertising people could be a better solution, but still not the best. friends could advertise each other even though they are scammers to scam even more players. totally legit players could get deducted by having flamers/people who dont like them saying that they scam. and again in a group of flamers that one player would be "a scammer" all out of the sudden.

the only way is: dont trade, or trade with people you really trust

lolol the forums are probably bugged again try to clear your cache, could fix it aswell