Four words: Student loans, insurance rules
I have no problem running a business, have done so successfully before. The thought that anyone can graduate residency with $300K+ in student debt and meet all the asinine insurance rules to get paid right out of the gate is crazy.
The only viable way for a new MD to hang out their own shingle immediately after training is if their schooling was paid for, they have a spouse who can pay the bills for a while, or they are single with no kids and moonlight for a while to supplement the practice.
It's not right, but that's the truth.