Agreed boycotting attending the match would be cutting off our noses to spite our faces.
Man U fans had a similar gripe at Fulham a couple of seasons ago when they charged £45 when the match with City was £25 and Wigan £15. United fans boycotted buying things such as programmes, burger vans, rafflle tckets, drinks ect..
I suggest we do the same by boycotting all of these and also dont go in their club bar but a local pub instead. Take your own butties. Dont buy anything at all at the ground.
However to get the message accross it will be necessary to make our opinions verbally known to the turnstyles operators, and burger van staff who might get the message if they dont make any sales in the away stand.