Fair point, but if the client does develop a preventable condition, it would be easy to show this is due to dereliction/negligence on the part of the physician, so the insurance would not pay out. If the client came down with a condition and the physician was not negligent, the condition would likely be non-preventable, wherein the refund clause wouldn't apply, anyway. Thus, regardless of outcome, insurance can never pay out, and the physician retains all the liability, i.e. no use for insurance.