Yeah, not that surprising. It makes perfect sense.
Most people value their lives at $5 to $10 million (ie: they're willing to spend ~$100k to protect from a 1% chance of death or so), so if you have a 1% chance of death each month, then it makes sense that it costs an extra $120k a month to keep a doctor on board since a doctor probably values his/her life a little higher since they have higher incomes.