My view is you can definitely make a go of it. I do actually know (and helped) one lady who was specifically looking for a paid encounter ... so yes, as small elusive and competitive as it is, the market is there. There are women who want EXACTLY what we ourselves are looking for, in every respect.
You need either good marketing skills, or a good agent (can help with the former but not the latter
)
And I personally believe you can define your own terms (e.g. no guys, no fuglies, or whatever) with the only downside being fewer clients and less $$ ... but if you're doing it casually that shouldn't be an issue.
Key thing is customer service. Give them what they want, and be clear up front about what you want in return. Many times that'll be more focussed on great conversation, flattery, dancing, a cuddle - and the sex will have to happen on her timescale not on yours ...
Try it, and report back, can't wait!!