probably by looking at invested amounts. if someone has paid say $100m for a 10% stake in LA Galaxy, its valued at $1bn. how investors arrive at that price, based on things you mention, is upto them.
this article from a year ago gives some idea of club values https://www.forbes.com/lists/soccer-valuations/?sh=21ee9394198b
maybe based on recent sales/investments, rather than calculating the asset value. Bloom would be in comfortable net profit if had to sell.
though looking at the revenue to...