Right, style and fun, you've got it! See, in my view, the sedans and coupes have smoother/cleaner lines than the ragtops. I'm not the only one who thinks this! A lot of people I know all think that coupes and sedans have cleaner lines. Plus they handle better, thanks to that structural rigidity that a roof adds.

Supply of convertibles versus sedans, that may be a key factor, true. For the 6.3 alone, probably 2-3 times as many were built, as total w111 convertibles. Just a SWAG based on numbers in my head, no research done here. But does that mean a 6cyl w111 convertible should sell for double to triple 6.3 prices, when you factor in how much more fun and more beautiful a 6.3 sedan is?

__________________
Current:
2021 Charger Scat Pack Widebody "Sinabee"
2018 Durango R/T

Previous:
1972 280SE 4.5
2014 Jeep Grand Cherokee Limited "Hefe", 1992 Jeep Cherokee Laredo "Jeepy", 2006 Charger R/T "Hemi"
1999 Chrysler 300M - RIP @ 221k