420 Tunnel club season tickets would bring in as much as 10000 level 2 tickets and SS3 get cheaper as you get further from the pitch.
I get that they won't visit the shop but City make more from the summer concerts at the bar than during the season. The guy who ran the catering said they made 20% more than the whole season at the Take That concerts a few years back and I doubt Liam Gallagher or Ed Sheeran fans were tea total this year.
If they want to make money reduce the number of season tickets and charge standard matchday prices like the dippers. Let the non-renewers seats be available on a match by match basis, that'll double the income from the seat.
Make the non family, family stand people move into the general population, that'll be another chunk of cash and manage the stand for the younger fans to attend.
They can make more money if they want to, Corporate might be a lesser evil