How about choice, I can name many examples all over this state where public and private campgrounds co-exist; chief among them is the Denali National Park entrance area. There is also a big difference in the quality, a public campground is almost always nicer. Riley Creek or a gravel pad where you are next to every one else and no privacy? Taylor Highway same, Chicken is all private but it sucks a few miles in either direction  are to two great campgrounds.