As much as many may wish not to hear this, doctor's are bidnessmen/participants in the labor market. In any FUNCTIONING market, some participants will prosper and some will whine and/or fail.
I get a kick out of our usual righter suspects who crow the wonderousness of some garbage collectors, or some auto workers, or some teachers or clerical workers complaining that their compensation isn't sufficient. But, when SOME doctors commence to complaining, they shout it as a sign that our system is going to hell in a bad-bad basket.
For what it's worth, if our healthcare system was 100% private and functioning-free-market, some 10% of doctors would whine about their financial circumstances. And...if our system was 100% "socialized", some 10% of doctors would whine about their financial circumstances.