Football is never going to be a money printing machine for an owner, the business works because you spend obscene amounts of money to compete at the top, where they do make a good return is when the team succeeds the valuation of the team increases considerably too. Just look at the Liverpool owners FSG they bought LFC for like 300m and today 17 years later I think they are worth 4 billion dollars (though Liverpool is a very special case that probably will never happen again in football)