Let's not forget, the gaming market is a lot larger today than it was 10, 20, 30 years ago. That's a lot more $60 games bring sold today than back in the 90s.
And there was a big decrease in per unit costs of production switching from cartridges to optical media. Not quite as much in the switch from optical media to downloading, but some.
Also, software is a volume business. They have far more customers now to cover those costs. This is why a lot of tech doesn't follow general inflation trends.
Or, you, know, if the market doesn't support high budget games, then don't make high budget games.