10 and even 30 micron filters are very fine; the threshold of visibility is 75 microns. Surely filtering all particulates over 10 microns our of diesel fuel is sufficient for the engines in these boats? And at that, it doesn't matter whether you run your fuel through a 10 micron fuel filter on its way from the tank to the engine, or through a 10 micron "polishing" filter on its way out of the tank, through a $700-$4000 process and back into the tank.
That said, getting a bunch of particulate out of ones tanks seems wise as it sounds like fuel filters reach the point of clogging where engines starve at the most inopportune time.
Guessing for $700-$4000, you can buy a pretty sophisticated fuel filter system and plenty of spare filters, true?
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