By turning healthcare into a humanitarian mission instead of a business venture. My local clinic is for-profit and found that it made better business sense to only have the most rudimentary neurology department possible since it tends to be expensive. Instead they focus on their financial bread and butter like flu shots and annual checkups.
Humanitarian missions and charity are notoriously ineffective at achieving real change. See, for example, the utter failure of aid organizations to achieve any fundamental changes in Africa. Meanwhile, big drug companies and their anti-retro viral cocktails changed the course of the AIDS epidemic there almost overnight.
If you had studied economics, you would know that profit and income are fundamentally different concepts. The existence of profit (rather than breaking even) implies a market failure.
I don't think anyone is suggesting that the doctors are making out like bandits here. Of course they do quite well, and since they are providing most of the value in the equation, every seems to be pretty happy about that.