I don't think it's comparable. The fee to the hosting site goes toward their time and service, I don't begrudge anyone that. It's sort of a match.com, you see where you need to go, what they can deal with, size, kids pets and so forth. You email back a few times to find a comfort level so to speak.
I will never have to pay because I was in when it began and I offer my yard.
There is never to be money exchanged, truly boondocking. There are people who offer city parking as well.