Another advantage on the Wet Coast is the wonderful greenish patina that the north side of the boat takes on as the long winter goes on. You certainly don’t get that in a boathouse!
Folks who keep their boats under cover also are stuck with their canvas. It never wears out. Those of out in the open get to change out our canvas much more often.
Back when we were in an open slip with our last boat, I spent two days washing the boat with a bleach and soap solution getting the green stuff off. The green on the canvas required a pressure washer after bleach.
Teak required frequent varnish. Fiberglass required waxing twice per year, buff every other year.
Boat had to be washed every time it got used.
Sandpiper fortunately lives in a boat house. I spend about 30 minutes with an electric leaf blower blowing the dust off the boat in the spring. I wash the boat 3 times a year with soap. Plain water housing off when needed..
When I am working on a project, I can stop at the end of the day, drop all the tools on the deck, lock up the boathouse and leave without clean up or putting things away.
I can work on exterior projects all year around in any weather.
I own the boathouse so will be able to recoup cost and most likely make a profit.
Downside to covered moorage; I had to hinge the mast. I had to remove the paravane poles.
Downside to boathouse ownership; bare styrofoam has to be replaced with tubs eventually, maintenance of the boathouse structure and sheet metal, no view out windows.