I summed it up but I don’t want to get in trouble for posting it. Here’s a snippet though:
Barca received €71.6 million from “normal” ticket sales for games, which was up 17.6 per cent on the previous year, when visitor numbers to the Catalan capital were affected by a terrorist attack in August 2017. They also took in €22 million from VIP and hospitality, a rise of 16 per cent on 2017-18, with Barca themselves claiming that more than 250 companies brought over 35,000 guests to the stadium to see games. Each “normal” year, they sell 900,000 tickets for games and 15,000 VIP packages.
This combined €93.6 million from match days is much higher than the €60.88 million which Barca took in from their club socios in 2018-19, of which just over €40 million was for season tickets. Overall, it means that the 900,000 one-off visitors who bought a ticket for just one game are more valuable to Barca financially than their 110,000 socio members, who are very unlikely to buy a new shirt every time they visit the stadium.
Maybe not that many socios would decide against renewing were Messi to leave but how many of the day-trippers making a once-in-a-lifetime pilgrimage might decide to change their destination should their favourite player now be performing elsewhere?