It’s about supply and demand though.
If tickets dropped in price to fill a 60,000 stadium, it’s getting filled.
60,000 - Average Ticket Price of £15 - £900,000 per match.
30,000 - Average Ticket Price of £30 - £900,000 per match.
However the extra 30,000 buy food, buy drink, tat from the shop, bet more, bring more to the local economy, so the overall revenue increases not just for the club, however the local area.