The OP posted this in the Full-timing Forum and he states 'aboard' not 'abroad' - two different things. :)
The majority of full-timers are retired and not working. Paying $30/night ($900/m) is a BIG chunk of change. We wouldn't do it either. Full-timing is very doable if you watch costs. You can't spend that much money per month unless you had a LOT before you started. Most full-timers are very thrifty.
Read some of his prior posts. He's been helpful on them.
Give the guy a break and suggest some cheaper means in Maryland.
Surely there must be some like in other states - i.e. national forests at 1/2 off with the Senior Pass or city or county parks...any boondocking in Maryland? We've never stayed there so don't know.