Interesting to read all the comments and views, and thanks to the other SPs who have added their perspectives. Since writing my first post I've learned a lot more from two of my regs who have opened up in more than the usual way. Its seems they both get texts and or WhatsApp messages as well as phone calls. They tell me they have multiple pretend punters who make out that they are arriving right up until the booking time then simply go quiet soon after. In my case, after 30 mins waiting and having got herself ready in paid for accommodation she offered me the booking. One girl suspects the same person may have tried this multiple times as she noticed similarities in the messages.
Due to my health issues I don't punt often and tend to revisit those I feel comfortable with after a few visits, so this was particularly anooying. I had another review ready but clearly can't put it up when they are not advertising. Both say they will re-advertise once in a while to get more regulars, so if an ad goes up I'll add it then. Both also say they'll now be asking for a deposit though.
I hope this update is helpful as my ability to contribute to the forum is otherwise limited.
Edit to pick up on MLawro93's comment. I prefere more amatuer types so yes, all the SPs I see at the moment have other forms of income.