Their R&D in designing a console and these nice controllers is probably more expensive for Valve than what they've got from selling actual products, but cheap smartphone is $40 in the more sanctioned Russia, so I guess something like $100 isn't an unreasonable price goal, and these folks are historically more into IT than we are, that makes me believe they can do or already did cheap controlling devices. I'm open to be wrong.
And yeah, military things are always extra durable and extra overpriced, but they are in a process to cut corruption to join NATO\EU, so probably the end price won't be that exhausting.