Apparently, in China, you paid your doctor only when you were well. If you got sick, the doctor would not receive any money until you were well again. This is in stark contrast to how it works in the west (and most other places) today. You pay for a service that may or may not have any effect, and if it does have an effect – may or may not be the desired one.
Health must be one of the few areas where there is no money-back gurarantee. You pay, wheter you receive the service you are seeking or not.