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  The Olympics also, the organizers rake in billions while the athletes get next to nothing.
context: Athletes get a free education and the opportunity to earn money through endorsement deals. Only football and men's basketball are profitabile. There may be a handful of women's basketball teams that make money. It's about profit, not revenue. 
  Thousands of college football players graduate each year and they compete for maybe a couple hundred NFL jobs. Some sports don't have professional leagues.