I'm suspicious because we seem to get a lot what appears to be paid shills or supposed employees joining SF praising whatever these peeps are trying to sell, like Harry Suits or Executive Custom Tailors, to name two recent ones. Then there's threads where some poor soul is asking for advice about the ill-fitting sartorial disaster they bought online from people like this.
The low price "bespoke tailor" scam is not even a new thing, I remember it happening in the 80s and 90s in the UK. There would be a large-ad in the local paper, an event is held at a local hotel, people pay money, and they either get horrible suits a few weeks/months later or nothing at all. Sure there was even a BBC "Watchdog" consumer report about this as well.
I agree that there's been quite a lot of suspicious new members posting 'what about this suit/shirt from this online company you've never heard of before?' threads.
If the OP is one of those he is a bit more subtle about it because he's posted on a number of other threads in quite normal ways, but that could be just a sign of more skilled PR.