Did you see my post regarding actually queuing for tickets mate? Let's say 20,000 go on open sale and you had to queue for those tickets with a supporters number etc, the idea isn't perfect but there has to be a solution where a family can get tickets before they sign in with a citizens matchday membership and tickets just don't filter down to those members in the big game cases.
I know and appreciate that people don't want to queue but there has to be a way to get face value cheap tickets that doesn't involve giving the club a way to just say there isn't any left, all the non season ticket tickets have been squirrelled away for hospitality packages and people who will pay over the odds and guarantee themselves tickets by virtue of their financial means.