I believe that *some* of that price may cover for the additional expenses of certification of a medical device, which AFAIK is a mix of needed checks that are useful to prevent serious abuses that could put the safety of people in danger and useless bureaucracy for the sake of bureaucracy.

Another part may come from "people are paying for this through an insurance, so it doesn't feel like their money, so let's just increase our margins!" (if medical insurances would cover them, which I don't know). Which makes even more worth of not getting your money.

Everything else is the standard practice nowadays of trying to screw the buyer of your devices by tying them to your "service", stealing their data and preventing them from taking back control. I'd say GO FOR IT!