I think that's where a lot of these characters go wrong... like that goofball with the "Tin Can" homemade Tri that couldn't do 200 ocean miles before falling apart after months of publicity..
The Tin Can Blog - David Vann's Epic Journey Around the World - Esquire
It seems anyone who pre-publicizes these kinds of efforts generally set themselves up for spectacular, very public failure or notoriety (Zac Sutherland an exception here).
Two other notable voyages were undertaken with little or no publicity, one (Kimchow) ultimately was unsuccessful and that was really too bad, the other was by Tony Gooch of Victoria BC (non-stop singlehanded circumnavigation) who didn't even contact the media until he was within a day's sail of completion. (Both Canadians, btw!!)
Kim Chow Around the World Circumnavigation
A couple of very different approaches... makes you wonder about the real motivations, doesn't it?