It is really profitable to win a tournament or getting the final three positions. Skill is better than luck, sometimes that "luck" is because in poker and in life there is a chance that some things are not going as you think they will. And some other times you just make bad decisions, some guys calls all in a early stage having 77, then table goes QQJJ3 and lost because a lower kicker, always have to think over and over, there are live poker tournaments that show how pro players have fold a full house because they were down.
Skill to know how to play and when you should make your moves.
Sorry for my English