Doing some quick math, if the upkeep is $5M a year, and you do camp 50 weeks a year, it could work out. With 80 homes you could probably easily house 400 people per camp, each camp is 1/2 a week, so you'd need about $110 per person towards upkeep. Probably $100 for food, $100 for staff. It look like they charge about $700 for 3 days, so that still leaves almost $400 per person for all the stuff I didn't think of.

The question is whether you could find 400 people 100 times a year.

Not to be funny, but considering its location and surrounding, I don't think it's attractive as recreational facility. Maybe obesity camp, internet addiction detox camp, or perhaps isolationist religious cults.