Sure, doctors, lawyers and engineers/architects and the like should be licensed because their expertise is technical and a laymen is typically not in a position to judge their efficacy.

How about Doctors who have lost their license for various reasons?

Go to doctor that's specializing on that.

Don't let the "Dr." salutation fool you, her "doctorate" is an Ed.D. in education leadership, not a PhD or a medical degree.These so-called "doctors" seem pretty adept at ignoring common sense and hard data. 

Including more essential ones like doctors.

So that was my point to this hedge fund manager how are you going to do it when all those that came before you could not  what do you see that others dont.And to me it was the Clayton Morris pitch  IE we rehab better than anyone else and we only put in doctors nurses police and firemen.. :) when in fact in those areas 90% of the signatures on the leases are unmarried females..

But I do question giving up being a doctor to be a full time real estate investor.

Yes, I received a B.S. in Physical Therapy in 2000 (it's now 8 years and a Doctorate to be a PT... noooo way) that I worked extremely hard for.

Don't go into $100k of debt unless you want to be a doctor or other guaranteed high wage.

College, in every experience I've known, is over rated unless you want to be a doctor/lawyer/tradesman.