#3 AFC Ajax
Ajax possesses one of the best youth academies in football and they reap the rewards on the field as well as financially.
Since 2003, they have made sales amounting to €453.1 million. Now, this number is less than some of the teams on this list but one must take into account the quality of players they sold. Ajax have sold some truly unbelievable players who then became world-class at their future clubs.
Luiz Suarez, Wesley Sneijder, Zlatan Ibrahimovic, Christian Eriksen are just the tip of the iceberg. Players like Marc Overmars, Marco van Basten, Dennis Bergkamp, Ronald Koeman, Johan Cruyff and many more left Ajax for bigger clubs.
Imagine what could have unfolded if they had kept these magicians. In spite of that, they are arguably the most successful Dutch club in history.