[Heinous]

I think cost is a bad reason to live on a boat. I think it will be in very few cases that you will spend less to live on a boat than on land. There will be exceptions, of course, but this is the most common reality. It can be done, obviously, but I am accounting for comfort, maintenance, seaworthiness, etc.

The exception to this is if you can't afford both a house and a boat, but want a boat. In that case, live on the boat!

I agree with the person who mentioned the difference between paying for something that is yours and simply paying rent for an apartment. The boat may be a bit more, but at least it's yours! You'll never see that rent money again.