There are some pubs or sex shop that have a basement not really used.
Why they don't install crux facilities?
It can be not that expensive for people, especially less than to pay a mistress for x hours.
* If there are more than one cross, it is cheaper, or one people can pay more to privatize
* If there is a crux room with lock and a glass, some spectators, outside the room can be charge to watch. Or the cruxees can pay to privatize.
* If the staff can do something else, and a a quick watch using CCTV, it can be cheap.
Of course, there is a risk people can leave with belonging of other cruxees. Some electronic systems can manage to keep everybody or nobody locked (until the staff or a timer unlock the group). then the cruxees use the crosses in "self service mode".
Initially design for other purpose, you can check https://github.com/BDSM-hardware/lock_handler
Why they don't install crux facilities?
It can be not that expensive for people, especially less than to pay a mistress for x hours.
* If there are more than one cross, it is cheaper, or one people can pay more to privatize
* If there is a crux room with lock and a glass, some spectators, outside the room can be charge to watch. Or the cruxees can pay to privatize.
* If the staff can do something else, and a a quick watch using CCTV, it can be cheap.
Of course, there is a risk people can leave with belonging of other cruxees. Some electronic systems can manage to keep everybody or nobody locked (until the staff or a timer unlock the group). then the cruxees use the crosses in "self service mode".
Initially design for other purpose, you can check https://github.com/BDSM-hardware/lock_handler