I know of a childcare center that was acquired recently. Not sure if by PE or just another business, but the employees are less than thrilled with the changes.
A rule of thumb is that benefits cost an employer 25-30% of salary. So you're already pushing to 50% of revenue going to direct salary costs. Then there are employees in non-revenue roles (HR, legal, accounting, IT, etc...) and employees doing non-revenue work.
Finally, you have rent, licensing, insurance, and all the other fixed costs.
So to your point, if we assume 4 appointments per season at one hour per, they are actually paying $100 in salary alone to only collect $80 season pass fee - a $20 loss! This business model is not sustainable
and then people complain why ther doctors burn out. what do you expect when you ingrained on them that every hour not booked is $80 lost, so we need to book them 24/7, cut their lunch break and squeeze every inch of life from them.
I think the place I take my kid to for therapy is likely private equity owned, but it's also about the only place available in my area.
I know they are charging around $80 per season, and I also know that the salaries for their therapists are around $25 to $30 per hour.
That leaves a very healthy margin for everything from employee benefits to building rental to admin (which I think is probably where the majority of margin goes).