Requires discipline, dedication, focus (and motivation).
Note that the game is based on manipulation + the art of deception by it’s nature, and exploitation. (whereas a Game theory-optimal (‘G.T.O.’) approach + experience nearly solves this).
Answer by Lina Wang (Macao, China):
A professional/good poker player lives/plays by his/her own skill and effort. Everything he/she does is based on his understanding of the game, the odds, player patterns, player psychology, good strategy and so on.
Using a well-honed skill (any skill) to make/win money sounds completely moral AND NOBEL to me, especially when it is something the person enjoys doing and takes pride in.
Passion is a pre-requisite for success on the highest level of anything!