The football club is a business that takes as much money from the public as possible, they exploit the love of their fans to make money off them. They didn’t have to do it but they did. We all need to recognize that too. 
All clubs must be willing to accept criticism from their fans, without them, the club will fail.
Football is very addictive and this the only the teams makes money from it, if there are no fans to watch the there is no money to be made and if there is no money then there is no money to give the players and football can't exist because the players wouldn't be compensated enough to work hard for other teams, promotions are just secondary money for footballs.
Though, I can't lie, some teams are very known to exploit fans. There was a time Messi ticket matches was over price in intermiami but guess what, it was sold out despite how expensive it was but I later found out celebraties were also invited probably to raise more money to pay off some of them. Football is now business.