You've framed it as consumer friendly but basically your hypothetical shop, on top of being another middleman, has gained a weak local monopoly on MRI's. That

You've framed it as consumer friendly but basically your hypothetical shop, on top of being another middleman, has gained a weak local monopoly on MRI's. That sounds like it's going to be bad for both consumers and hospitals which is why it would never happen. As a sidenote the problem with MRI's isn't a lack of supply. A popular factoid a few years ago was that Pittsburgh had more MRI machines than Canada. Even if that was only half accurate it tells part of the story about high MRI costs.