Wish I could help I looked at a couple and see the same ones still advertized. Resale? Nadda...special use boat with limited marketability.
I'd like to have one as a 2nd boat for poker runs but if I could only have one boat, no way. I would say $180 as a guess. 2002 gladiator listed at 165K, 2003 with nice paint $219K. Spitfires 2004 Gladiator listed at 199K and the 2002 OSO boat at 139.
Boat will never have the resale of a cig just because of the name. If you can buy a 2004 Gladiator with 525's for 199 I think the Donzi has to be under that even with the 575's.