NFL RefereesUnlike referees in the NBA, NHL and MLB, NFL referees work on a part time basis. They work a total of 20 games including the preseason. Top referees and their crews have an opportunity to earn additional money by working the playoffs and the Super Bowl for which they make an additional $11,900 at the time of publication. Though NFL referees earn lower yearly salaries than referees in the other major sports leagues, they actually earn a higher per…