Interesting idea with a MP Jetfire, Darkmatter
I think youre correct about him being expensive, if Hasbro were to produce one. ... Given the prices of MP BW Dinobot & BW Megatron, it would be safe to assume it would be either on par, or quite possibly exceed those.
I havent paid much attention to the Third Party scene, but what little Ive heard those that have gone the 3P Jetfire route seem to be quite pleased. ... So that could be an indicator of what some are willing to pay for a collector type of bot.
Surprisingly the Siege version has a lot less “battle/weathering” paint app compared to the other bots in the line. ... However, as you said, it’s not for everyone.
