there is a user called FmaTR that has thread with 154 replies. Sounds cool, right? Then I checked his thread and absolutely every reply seems to be done by him. 99% of replies are from accounts that have only 1 activity. A user registered on Bitcointalk just to write a post in his thread to highlight how smooth deal he or she had with FmaTR.
You have a vital information and observation made here but am sorry there may not be any action this may attract because scam is not moderated on the forum first, the user does not break or violate any forum's rules and regulations, it's not a must you have a deal with such user, you can even ignore him if you so wishes, as for the other accounts making replies on his thread only with one activity, sooner or later their bubbles will get bursted soon except they have nothing fishy under their cupboard hidden.
Definitely, this is absurd and we can confidently say that this user creates fake accounts to write positive reviews about his service.
Have you got any evidence that linked them all together under same user? If not then you may be accusing wrongly except you have enough evidence over that, many uses the opportunity of creating alt account to pilot their ratings and reviews but yours is to be very vigilant not to fall on their traps.