Don't anyone be fooled that these are season tickets on the Exchange. They are returns of blocks of seats from the touting sites, who City give the seats to, but who couldn't sell for this one.
Livefootball Tickets had 2,500 seats listed for the Manchester Derby on December 15th. They are the same blocks of seats, and they will be full of United fans, guaranteed. I've sat there, it's a morgue, mostly disinterested observers, or opposition fans.
That's the way it is, huge chunks of seats released to tout sites, and all home games for the rest of the year looking "sold out" on teh official site, so people have to buy from touts. Bastards.
(Also charging £50 at home to Forest on a Wednesday night is just stupid.)