I think the main problem was the Cheshire FA setting the prices and generally we've found over the years that we tend to be generally 'price inelastic' due to a number of factors.
i.e. If we charge half the price we don't get twice as many fans, if it had been £5 last night there wouldn't have been 466 there.
There are a number of factors for this (competitio, apathy etc) which makes pricing intiiatives difficult to assess. In an ideal world obviously prices would be a couple of quid lower for everyone and people would come down more but it isn't that straightforward. And on a tight budget it's not always possible to gamble on these things, i.e. Mansfield letting everyone in free for a game etc.