Yes, $50 was a rough out-of-pocket estimate, the amortized cost per scan for operation alone is probably on the order of hundreds of dollars per scan, assuming high utilization.
One funny thing about MRIs is the magnet is always on, so there could be some clever ways to reduce costs running them after hours.
> there could be some clever ways to reduce costs running them after hours.
It seems like a dedicated round the clock facility housing at least dozens of MRI machines ought to offer significant economies of scale. I wonder if I'm wrong about that or if there's some other reason we don't see this approach taken by governments.