Some older boats do not have HIN numbers, right?
Correct, but this is a 1985 (HIN ends in 85) I believe and so it has an HIN.
this guy may be going through a divorce, and trying to hide assets from spouse.
that additional amount of income might also affect child support or his income tax bracket.
these were the first things that came to mind..
or the guy may just be weird..or dishonest (as in make sure you see something resembling a title)
If he sells his boat, I don't think that's income. There's no way for the IRS to know about it...