I have doubts about some things, the first, how do you know when he is a professional player and when he is not?
If you are the fish at the table, you are not going to know it.
Good words. But I have something to add:
As it was said in
Fargo:
If you don't see any fish on the table, means YOU is the fish Well, you're right about that, sometimes a person is looking for a way to help, and not everything is free, even if they decide to charge for it, well, you have to respect them
This is very rare case, about free lessons. This person will spend his time on you, teaching you something useful. His time should be paid. Everything fair