Last year I bought into a boat with two other people. It was May 24th. I sold my interest on September 28th (or thereabouts) of the same year...for what I paid for it.
It was too much boat for me and the sharing concept, while sounding good to begin with, didn't work out.
We went out on a Cat style pleasure boat my sister and her husband bought and all of us got the "bug" again. I may buy something small for next year by myself.