You cannot expect to pay the same price in 2004 that you did in 1994 for a concert. Inflation and overall price increases control that, an AMC movie ticket is around $9 today, 10 years ago it was probably $6, price increases will occur.
Inflation doesn't cut it when its hovered between 2-3% over the past 20 years and ticket prices have spiraled out of control over the past 5 years. This is all Clear Channel's doing I'm afraid. I'm not sure where you were sitting for $90 but I saw tix easily costing approx. $200 Cdn each for floors in Toronto. Of course ticket prices go up over time but now they're outta control now and beyond the reach of the average fan. My argument is more about value for money and quality of the show itself. I got more out of the 1994 concert even though some of the songs on the setlist were re-hashed from his 1987 concert. I didn't care that the ticket cost more money, I just got bummed over time that I was listening to practically the same setlist over and over with the new album songs in between.