I wonder the same thing as I drive around, I see lots of campers that haven't moved in years.
Last year I looked into storing the RV in Florida off season at an outdoor storage. I saw about the same thing. I talked to the owner, and he said a large proportion haven't moved in many years, this is both boats and RVs.
I didn't store mine, I use it too much, I wanted to have an idea of cost. One thing that makes it real useful is my grandson lives in Ohio, just 2 miles from Maumee State park. I go down a couple times during the summer and he camps with me. We get some quality time together. When he comes up here to visit, I take him to Jellystone in Grayling, MI, which is real close. They have lots of activities for kids.
I use mine for more than just camping, its also a motel away from home when visiting, or other activities.