Your experiences very much mirror mine, and is why I wont opt for RBs now. I've aske for dress sizes 6-12 but got many BBWs replying. Potty or what?
Funny how so many fall ill or have ill family members, and I suspect it's a case of cold feet.
I've had replies from 100+ miles from where I was staying, which after travel costs would have left the girl with less that £80 for an hour's work, and IMHO, not worth the effort.