From an economic / logical pov, I'm not sure
any of this makes sense
But from a hobby, let's enjoy ourselves, pov: I think it makes great sense to mess with 120 cameras. Even if your wish is for contemporary RF cameras (let's say the '80s to now) there are several to choose from - you don't have to choose a brand new one, and with most used ones your 'rent' should you sell it later will be much less than buying the latest digital and then selling it in 3 years.
And yes, running film through the camera is not all that expensive. Home dev + scan or photography of the film is even cheaper like pinholecam says.