Depends on the bar. A very few-no idea if these still operate, or if yes on the old method, indeed did not charge off-fees as all guys were freelances-this also means there is no method to keep them attached to that bar. They may just butterfly around to see where there are prospects (maybe you......)-or not. or it might not have been a ´gay´ bar at all, it was just an incidental hit/meet.
It is always possible to avoid the fee by making an arrangement with mister B to come later to your hotel-with the odd chance that someone else might hire him in between. But with all the apps etc I think it all gets superfluous soon.
Really-I keep on wondering why so many seem to think it is all running on prescribed military ways-nothing works like that anywhere In Thailand. Which also means you cannot really rely on --yesterday it was there this, so today it is here?