I have heard (but know little about) that at a certain size or below, if you want to move your boat say from the US to Europe, it pays to ship it aboard a giant ship rather than have your crew sail it. Is that true? What would be the cut-off? Any other down/up-sides? I'd really appreciate any education you can give me on this, thanks! If it helps I'm thinking about a boat in the 150' range or so.