There are some very high end resorts that cater to million dollar rigs. If I had a rig like that and the money to stay there, I would want like coaches only to be allowed. For us, we stay at County Parks, National Parks and all sorts of campgrounds in between. The one thing that will deter us from ever going back to a particular campground are the types of people that are staying there. If there are a bunch of permanent residents with junk strewn across their site, we're not interested in camping there.
This doesn't make us snobs, just makes us intolerant of dirt bags! I'm done with worrying about being told what I must say or think. Political correctness has become a joke. Don't criticize a rolling meth lab, it may offend the addicts inside! The condition of a coach generally reflects on the occupants. I understand as people get older, it gets more difficult to maintain a rig, especially if you're on a budget, but keeping it clean and preventing it from looking like a rolling lab isn't that expensive or difficult.
If you make blanket statements about never staying at a park with a 10 year rule, than you really haven't put much thought into why the rule exists.