It's against TOS to do so on these forums. pretty stupid right? it's also 100% legit to sell AA obviously claiming a 4:1 ratio when really its 4 AA for 10m a pop in a package store.
It is against the forum rules to post names of possible cheaters, and posting names of possible scammers is libel. If a person is trying to scam by using a game cheat, you need to report it to the GMs. Beyond that, players are responsible for being careful when they make exchanges with others.