When to use water pressure regulator on fiver?

We in fact have a pressure regulator with a guage on it we purchased from CampingWorld...about $55. I have it set for 55psi. It sure is nice to see what the actual pressure is but that is just me. We went through a number of the simple brass ones that cost just a few buck but always seemed to have had problems with them. Personally like the new one. Threw out this question to see if I was on track and apparently I am. Appreciate the comments.