I felt the same way when playing football in high school like you describe. However, that was high school, we had lives, grades, girls, and things that were just more important. This is their professional careers, this is what they do in life. Its like your career, you dont want to stay at an entry level position the rest of your life because you can skip out early when other people are working. You want to become the best at what you do, whether that be manager, CEO, whatever. I think that's how it is for the players.