Most who complain about KOA rates state that they don't need the amenities and don't want to pay for them. And that is fine. Actual problems stated about the park itself are not out of line with complaints about any other privately owned park. And for those people, there are a multitude of basic, low frills parks around to serve their needs for lower prices. But there still seems to be that need to complain about prices.
And I know what you mean about hotels after 30 yrs of traveling for work. From hotels less than $75 a night a number of years ago, to the same chain charging $150 and up.