Soccer fans protest plans for a European Super League. Rob Pinney: Getty Images The ESL was set to be one of the most elite and wealthy breakaway football leagues ever. Despite the league's collapse, it's triggered a fan-led review into clubs' financial situations. Two football finance experts told Insider how clubs earn money and why they get into so much debt. See more stories on Insider's business page. The new European Super League (ESL) came crashing down recently after nine football clubs pulled out of the plans following huge backlash from fans, politicians, and players. The 12 teams that were