Why do people with huge, and expensive rvs camp out in the middle of the city?

They are mostly retired people, and they should have planned out a real camping spot. Those huge rvs should never overnight park in the middle of the city. If you are going to buy a hundred thousand dollars or more rv,then park at a campsite.
Update: Are they that stupid to buy a really expensive rv, and overnight in front of a grocery store. There are truck stops, Walmarts and other places.
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