I feel compelled to chip in that I see A LOT of the TS’s you’ll see on birch place on the fabswingers website. Most of whom will happily chat to you if you message.
I certainly wouldn’t ever pay for a TS as you can definitely get it for free on there. Just saying 
Some are, some aren't. That's exactly the same for CIS girls. Fabguys is also worth a visit if you're trying that one for TS.
Thing is, they get 100s of messages a day on fabs (especially the CIS girls - presume the TS ones do as well) so you're lucky if yours gets read. They also often have restrictions around who can actually message them based on age, status etc. which you may or may not fall in to.
And the major difference, if you're lucky enough to actually arrange a meet on fabs, you're there to satisfy them. With punting, they're there to satisfy you. That can make a huge difference in what you'll actually get from the session.