How do they expect to collect this "fine"? They're not a government agency, they have no executive branch to execute enforcement or judicial branch to mandate enforcement.
Sure they can put words in the rules that you "agree" to when you camp, but are they going to spend $5000-8000 in court to collect $75 from you?
Home owners associations and apartment complex that use this same service at least have a captive audience, they can force you to pay the fine through threat of eviction at least... I think if you called their bluff they'd be in a hard spot. Eviction is not an easy or fast process, especially if you own the home/condo or are otherwise current with your rent payments.