I’m not sure you are correct in that - MRI scanners are expensive to run as they are rarely as low priced as you are suggesting. See link below which is a little old but gives a spread of prices. Note that the prices cited i this thread is less than half the US average.
Another factor that is relatively rarely discussed is the quality. You can do a fast scan or a good scan. That’s inherent in how MRI works.
A good gynaecological, cardiac or liver scan takes about 45mins, and there isn’t much you can do to improve on that as you are limited by metabolic activity (eg liver or heart contast wash-in and wash-out). If corners are cut here diagnosic quality will be reduced.
I regularly see scans that are of such poor quality that they are initially mistaken for the survey scans/scouts that we use to localise the patient in the bore. They are generally from places that you would intuitively avoid for healthcare, but not always.
I got charged with two things - XRay and MRI. One was enough, apparently... And I wasn't in any critical condition to an XRay immediately.