Along the same lines, I once saw a lung specialist for COPD. Tests showed lung damage from emphysema. He stressed that there was nothing that could be done -- lung tissue didn't regrow -- charged me whatever his fee was (it was so long ago I don't remember how much, but it wasn't cheap) but then wanted me to go back for a follow-up consultation. Why, for heaven's sake? On his own admission there was no treatment available and there was going to be no improvement, so why would I need to go back just to be given the same advice again?
Then, when I didn't bother going back, he got shirty about that fact with my GP. I confess I had a feeling at the time that he might have been a bit of a rip-off merchant, and I felt vindicated when my GP told me, with a grin, about this person's reaction.
By the way, the link that Grahroll just posted is well worth reading.