'Supporter Clubs' own over 80% of Bayern Munich.
Members of the Bundesliga have to operate on a 50+1 principle regarding ownership. i.e. fans must own more than 50% of the club.
Actually they probably couldn't thanks to a small thing called FFP.
As their total player wage exceeds £52M then any increase in their wage bill above £4M has to be funded from additional football revenue.
As soon as you accept that football is a business then the high prices do become justified - the purpose of any business is to maximise revenue and profits for the benefit of the shareholder.
It could be argued that Amex prices were too low for the first two seasons as there was a waiting list...