Oh hey, I thought I pipe in... 2nd time poster, long time lurker, thus giving a disclaimer...
There was a somewhat related example with public place smoking laws a decade ago in Smith falls, I was reading an article, full details escape me, but legally it goes:
It was basically a bar (business entity) with regular clientele, displeased that they can't smoke inside or on the patio anymore, but then they converted the place to membership-association type, therefore the business act didn't apply, but the Financials of the place was intact. And it allowed them to smoke
It has to be non-profit, membership fees and services decoupled, as in drinks amenities etc... you just pay your monthly fee.
Obviously, there would be verifications, who is the club so to speak, with NDAs all around, million $ penalties etc... so that what happens in fight club, stays in fight club

, without actual fighting taking place.
But that would be the legal key, decoupling fees for services.
It would provide for better system, as in taking out the guess work (annoying for both sides), as per allison_xox above, and frankly, feeling comfortable both ways, and taking much less risk, for us customers and SPs. Half of us have family lives, so at least i cant afford ad hoc screening, as much as I would like to see you great ladys. I understand your reasons for them, nonetheless. But this would take care of that.
SPs could benefit, given enough people in the club, that they can have stable clientele, and not worry about ups and downs of being self employed, and not have to up or lower price for their services... you get controlled volume, but no derogation of quality...
Fees should be distributed accordingly, but as mentioned not direct; then its 2 people(s, haha) having fun. From I understand sps are legal to provide, punters are not legal to obtain, including gifts in kind, as in presents; Even sp providing service hosting, worse at a business place like a hotel, is technically not in the clear.... but not to get side tracked...
Where? Heh the magical question... the only thing I can think off, to keep it cost effective is one of the lovely ladies place or maybe one of our single friends, don't know... the payment of that would be the monthly cost of the place, in my mind...
Just a food for thought, thinking outloud kinda... it would take some work, buy I think not exceedingly impossible, but I might be off or wrong. Feel free to chime in.