Because there are a finite number of doctors and hospital beds and you can't create either by throwing more money at the problem. You didn't actually read the content did you

The doctor has already managed to find time for the service - she’s seen you. Potentially even done the procedure. The hospital has made room for you. The resource is already consumed by you, like a restaurant meal. The question is who is picking up the check, when you already have a subscription service paid for.