You need to break down the components of the insurance. I'm talking about the hull loss coverage, not liability coverage. That's what insurers are most concerned about with a retractable airplane. The proverbial gear up that writes off the prop and engine or does enough airframe damage that it cannot be economically repaired.
There's a few things working against the Cirrus:
- The hull value difference. The in-motion hull loss coverage for replacing a 40 year old, 200 hp $90,000 Mooney M20J is a lot less than the in-motion loss of an equivalent 200 hp (but, of course newer) Cirrus SR20. The oldest S20s (circa 2000 +/-) are going for more than double the value of said Mooney.
- The parachute writes off the airframe if deployed. For any reason. The insurers might be giving Cirrus owners a break on their liability premium because of the parachute, but they are more than making up for it if the plane is covered for in-motion hull loss.
- Composite airframe repairs. Seemingly minor damage to a composite airframe can turn into an expensive, involved repair process if there's any structural integrity issues at all. Aluminum structures are well known, ribs and skins are replaceable (have a look at the pictures of his Arrow on @hindsight2020 thread he started earlier today). One of our Club members collapsed the nose gear on his composite plane (a turbo IO-550 Lancair ES) and damaged the composite firewall. It's turning into a nightmare for him as the insurance company wants to write it off as they are unsure if the firewall can be fixed properly.
A little while back I was toying with the idea of selling my twin and replacing it with an older, Avidyne equipped turbo-normalized SR22. Go higher, go faster, burn a bit less fuel, half the spark plugs/filters/oil and no retract issues. Met with the lead underwriter for our Club coverage (not the broker, the underwriter). Was an interesting conversation. Among other things my in-motion hull coverage would more than triple - partly because of the much higher value of the airplane and partly because, in their view (I'm paraphrasing),
"anything but the most benign of problems will result in the parachute being deployed and the airplane written off".
$90,000 asking price:
https://www.controller.com/listing/for-sale/196319025/1980-mooney-m20j-201-piston-single-aircraft
215,000 asking price:
https://www.controller.com/listing/for-sale/202262139/2000-cirrus-sr20-piston-single-aircraft