For my own purposes, I estimate that a custom boat immediately loses 50% of value for re-sale. This is assuming it's sufficiently attractive to a wide enough market to be relatively easily sold. However custom boats can tend to be pretty unique (insert 'unconventional' ) to accomplish owner specific goals/values as DDW suggests. I would plan my 'investment' with a 1/3 resale value for those types, like Ginger (previously mentioned) and perhaps DDW's boat, though I don't think his is too far to the unconventional overall). Most custom boat owners don't really expect or plan on getting their money out of their boat for resale, or at least shouldn't plan on it!