I think there should be some form of tiered membership. A few counties do this so you can buy membership for discreet competitions, such as T20 only, all white ball games, championship matches and any combination. Maybe buying 10 days county championship cricket for, say, £100 would an answer?
It wasn't that long ago that members got 8 four day games, a tourist fixture, 8 40 0ver games and two group stage fixtures in the B and H cup (I know you can go back 40 years and there was even more) so there clearly has been an erosion of days to watch.