They never use their own title.
For a show called "Tiny House Nation", they're afraid to use those words. I'm halfway through S2 and I have yet to hear John say "John and Mary have moved into their new tiny home and joined the tiny house nation." He always says "tiny house movement".
Why?
Oh, side note: the S1 house built for the travelling nurse and record guy was already up for sale. http://tinyhouselistings.com/listing/keizer-or-12-28ft-tiny-house-as-seen-on-tiny-house-nation/
They sure didn't stay in it long.
Just found the Oregon couple who rebuilt after a fire in this article:
http://www.techinsider.io/five-people-who-abandoned-their-tiny-homes-2015-7