So do writers, philosophers, sociologist, teachers, hell anyone with a PhD
See the frequent doctors' strikes in UK. It's a joke. Some of the doctors with decades of experience earn quite a bit, but it takes a lot of time to get there. Anyway you made terrible comparisons there.
Gender studies sociologist don't earn much? Boo-hoo. To hell with them.
Know about Stalin killing off all doctors and then not being able to find one when he needed one?