It's important to note that a person who lives on a boat at anchor, on an official mooring or in a marina may very well not be an actual mariner. The act of living afloat does not of itself confer the ability to move the vessel from one place to another, and in fact a vessel used as a home normally becomes a stagnant hole in the water as immobile as a mangrove. And it is not completely surprising to find that many of these vessel actually lack any form of propulsion, such that if they do need to move they are unable. Admiral Lord Nelson is said to have remarked that "men and ships rot in port," advocating an active life under sail for both.
I suppose any one who has not joined the tribe for any length of time might think it romantic to live thus, that view may be tempered the next time a storm blows through with wind and rain and visibility next to nothing and waves smashing the beach and that would be the time one has to row ashore and get in the car or on the bicycle to get to work.