These were highly paid private doctors, one the head of the EMG department at a large hospital, the other an important neurologist at Johns Hopkins. At the time my insurance had very few restrictions on tests, treatments and medications, and I was offered further genetic testing and a spinal tap but assured there would be no change in the treatment or diagnosis so I elected to let it drop as there seemed no point in further testing, and neither doctor felt that an ongoing relationship would be necessary. Once they know they can't help you they lose interest. I think it is more related to feeling it is a waste of their time and skills than money. My local neuro even said she would be taking money "under false pretenses" if she continued seeing me.