For those who want to know more about that master price list and how its prices have little to no correlation with reality: http://www.time.com/time/magazine/article/0,9171,2136864,00....
This is why the mandate in Obama care is so important, to stop this cycle.
In any other industry the practice of inflating the value would be illegal, specially when done in the cartelesque way it's done in health insurance/healthcare. 'Luckily' the health insurance industries has managed to lobby its way into getting all kind of exceptions, and our representatives are hard at work to keep it that way.
I guarantee that at least in this situation his practice is not turning a profit on these surgeries. $300 certainly doesn't cover the labor expense.
This story is, of course, anecdotal. I'd be eager to hear of similar stories of Medicare reimbursing appropriately.