I don't know what is your definition of poor return.
Most radiologists in my area work less night, evening and weekends that other specialists, saving derm, rad-onc, ophtho and very few other fields. The salary is similar to many other higher paid specialists except for spine surgeons, orthopods and very few other surgical fields
Perhaps for some partnered established rads. But those coming out of training have much worse income prospects. Getting true partnership type jobs anywhere near a popular/metro area these days is difficult. And if you do, there is a good chance that you will be an employee by the time the health system gets taken over or consolidated etc.