I mean, there's no need to get indignant. I'm not condoning it, but such a circumstance is hard to prove in the first place. Many have accused henning of doing that very thing. Took a 709 ride and got a check for an airplane many thought he'd have a tough time selling for what he got out of the insurance. Personally, I think he truly had a brain fart, but if he didn't, nobody was able to prove it, so the point stands.
--brk brk--
As to the OPs question, it's an inconsequential difference. My insurance policy on the Arrow is around the same rate as my insurance on the WarriorII I used to own more than 5 years ago, with a +15K insured hull difference on the Arrow on top of it mind you. Granted, I'm a professional pilot so I exceed the trigger the insurance uses for low-time pilots, which does make a significant difference in the premium for the first year. Most folks see that premium disappear within 100 hours of retract time.
Much a big deal is made about retractable gear. It just isn't a big issue in my experience. For me, financing costs for a six figure airplane is orders of magnitude a limiting factor to my participation in this avocation, than insurance or mx complications supposedly arising from retract gear ownership. To each their own.