Many people suffer from these things called Phobias.. For example I happen to suffer from Acrophobia (Fear of heights) so when you understand I used to work in the roofing trade.. You know I had to learn to control it, big time, (it has re-emerged a bit since I stopped falling off roofs.. Though I can still make it to the top of my ladder on the RV.. I really do not like more than 12 feet at all (And not all that comfortable at 12).
Some folks have .. Well.. Poop-a-phobia. They just do not want to deal with it.
What can I say.. Some folks do not even like RV's and would rather stay in a hotel where you do not know who last slept in the bed or what is under it and you can only hope they did a good job of cleaning.
Others, would rather RV.
Many people = many different phobias and likes.