I punched $10 1976 into the Bank of Canada inflation calculator and got $52.27 today. If you are being fair, this is the number to compare against. (Inflation may vary by country.)
There are a lot of concerts you can still go to today for $52. Just avoid A-list arena shows.
I don't know if the same is true in other regions, but of the 4 shows I bought tickets to in the past 2 years, the most expensive were $56 after tax.
Ticketmaster is awful, but I've still been able to find at least some of the shows I want to see at reasonable prices.
Granted these haven't been huge acts, but big enough that I could mention them to certain friends and be reasonably sure they'd know what I was talking about even if we'd never spoken about the band before.