ubiquitin
My Ruv tried working with that model for many years, saying that the usage of a Mikva should be akin to using a siddur.
After having this policy for close to four and a half decades he finally gave up about 5 years ago.
When people were okay with dilapidated mikvahs it was feasible. People today expect a much better experience, including better towels, soap and other amenities. Besides having to rebuild the Mikvah, taking care of it and replenishing it is a costly endeavor.
I forgot the exact figures he told me, but he explained to me that simply washing and replacing the towels cost over a dollar each time someone uses it. And that’s just the towel.