If you add up home games, away games, cup games, an expanded CL next season, Wembley, increased food, drink, travel, transport, etc prices over a season, watching football Is a lot more expensive than it used to be, even taking wage rises into consideration. That doesn't include the cost of living increases across the board. If most City fans could get an away ticket they would go away as well.
Most people don't go to a restaurant, a theatre, a night club, or out on the beer every week or every two weeks. Sometimes there are 3 matches in a week. And 2 matches a week on a regular basis.