When to use water pressure regulator on fiver?

Don't use one and havn't for some time now. I stay in larger parks and doubt they have a major problem with pressure or they would not be in business. Many of these leaks and blow outs are weak spots in the RV, not because there was excessive pressure. Maybe someday I will find that park with 80 psi of pressure and will spring a leak and start using one,,,,maybe.....