The prices may seem steep. Two weeks I ago I paid £9 each time to ride a roller coaster. I went on it 3 times in a row. Some may think it's crazy. But when you find it out it takes 80 trucks to deliver the roller coaster from Germany to Hyde Park Winter Wonderland each Christmas and there are about 8-12 staff working on busy nights on the ride I don't think it's much.
It's the same with a £50 comic con. When all is said and done Meat probably only sees 20% of that if he's lucky
People spend all ranges of money on things that may not seem worth it from thousands on a "Banksy" to £200.000 on a car to £10.000.000 on a house. It only matters to the person who spent it if it is worth it or not, not the ones who see a price and think "Nah, that's too much for me."