"... Park one in an RV park and you can live inexpensively..."

Being a full time RV'r, and not a sailor of any kind, I would have to agree with you. But there are RV parks, and then there are RV parks. The less expensive one are often full of "trailer trash," those with their RVs anchored to the ground with spiderwebs and supported by the stack of empty beer cans and bottles, loud screaming and yelling going on 24/7. Those without such problems often do not have a monthly rate, making them very expensive. And prices of course vary around the country. Friends were recently workampering at a place in Florida, got fed up with their boss, and quit. Then they discovered that the monthly rate for a site in that area was $800. They really had to scramble to find another "home." Many KOA's (which we avoid like the plague) cost upwards of $50 a night!!!