The behavior exhibited in the account owner's thread named FmaTR drives opinion towards dirty behavior by creating an atmosphere where someone is satisfied with the service offered by Op. Although the existence of suspicious activity that occurred in the Thread needs valid evidence to make accusations Op has used multiple Alt accounts to highlight how satisfied they are after doing a deal with FmaTR.

There must be an element of suspicion after seeing that 99% of users who only had 1 activity immediately found the thread and as newcomers they dared to make transactions with someone who doesn't have a good reputation on the forum. Surprisingly after writing a post in the thread with a high level of satisfaction with the transaction that occurred between the two parties, they immediately left the forum on the same day they registered.

Here are some users who only had 1 activity then left the forum the same day after he registered, there may be many more on different pages.
☛BrynnK
☛bm92
☛intreos
☛tehooh
☛amibumping
☛Vrotdugis110

It clearly looks suspicious which leads to a scammer, as long as there is no valid evidence you cannot accuse him of having committed dirty practices that could harm other users. However FmaTR should be suspected (not accused) because 99% of buyers are new accounts with 1 activity.