Gigs are crazy expensive these days and I put it down to 3 things.
1. Bands dont make money from selling music and so need to make their money on the tour and merchandise
2. Middlemen ticket companies ripping the **** out of it. Plenty of tickets need to be booked via ticketmaster (who charge a fee per ticket) and are then straight away resold on places like Stubhub (who charge a fee per ticket). Worth noting that Ticketmaster owns a lot of these ticket tout websites like stubhub too...
3. Gigs happen mostly inside of big buildings in the middle of cities - and these are expensive bits of land. Just one more example of inflated land prices draining money from your wallet.