Our tout tickets are more expensive because we'll pay it, but that's because finals are a bit of a novelty for us. Our last 3 finals were all against sides whose fans know another final is around the corner so they won't pay the prices. I'd rather be us and a final is a big deal mind.
As an aside, if you go down on the day hoping to buy a ticket don't wear colours. Man City club Wembley tickets will probably be about half what ours cost.