I honestly think City need to start offering a season card that gives you access to every home game which includes League Cup, FA Cup and Champions League, People don't tend to sign up to cup schemes on the basis they may not know their financial situation at the time of the money been taken therefore they would rather just wait and see either if they can make the game or more importantly if they can afford the game, If City was to offer a season card for every home game it would increase crowds and as a fan you could span the cost of the games over 10 easy payments rather than for example this month two lots of Money coming out for the Palace game and the Seville game.
If City was to next season offer say all the cup games for say £145 on top of your season card price, which you would be looking at least 6 games (4 in the champions league and 1 in the FA Cup and 1 in the League Cup) then that would show great value for money and lets be honest you would get more than 6 games i reckon.
This would be a choice rather than what United do and i think would see an increase in crowds and would make things a lot easier for fans financially...