I'm not sure we know that, really. It's just as likely that there simply aren't that many really iconic vehicles in Marvel relative to GI Joe or Star Wars. Now, price sensitivity, that is real.
Right, and this is why I think the VAMP approach, specifically for the Fantasticar would work. It's "easy" in a relative sense to make a version that's good shelf decoration for a cost people will likely be willing to absorb (considering MTOP pricing). It's one of the few Marvel vehicles with real pedigree, and presuming the team is willing to make it without all the bells and whistles I think it has a much better chance than EoV.
So, while it's probably not the upcharge they say it is, electronics are annoyingly expensive, judging from my experience just trying to buy kits for the makerspace. Especially if you want things like lights that have any kind of programming to them beyond "off" and "on". Like, as much as they say? Ehh, we'd have to look at some factories. Is it going to make it a premium price? Yes, definitely. People thinking there should be an easy way to get the EoV with all the features for less than ~$200 are just incorrect. We've seen other companies try. If you add lights and sounds, it's going to jump the price noticeably. You can do a simply plastic vehicle for around $100, and multiple outfits have done it.