Because...the club can't sell hospitality @£250 if there are loads of normal seats together available at reasonable prices.
So they squeeze availability, and people from abroad looking to come to a City game will see that the only way to bring a family and sit together is to buy a package, despite having already bought matchday membership. That's what happens.
Loads will be on soon tellng us that (i) it's the Bournemouth SS3 returns (correct) and (ii) the rest are all season tickets returned on the Exchange (BS).
I no longer even worry about match tickets before booking flights and accomodation, even if the game looks practically sold out, as I know the sales pattern that has evolved..
I'm not complaining (any more) or ranting.... just explaining .