The word bribe to speak because you are an expert

The word bribe to speak because you are an expert in an area of medicine is so inappropriate. I have a friend that has had multiple sclerosis since college. He became a neurologist and knows absolutely everything there is to know about MS. He runs an MS center and has a huge practice. He is paid to speak all over the country. This is very demanding, and he has to be compensated. He talks about his experience and what drugs he has taken through the years. He updates neurologist on the current status of treatment for MS. He is believed because he is actually on the drugs. He is a gift to society. Anyone tops in their field needs to be compensated. Just letting you know there is more to that story.