Hard to tell how it's going to balance out, but presumably the 10% figure is taken from the computer records so I guess is accurate. If it's also an accurate reflection,
in general, of how the new management is perceived by those who have, shall we say, declined to support the side recently, then I'd say it was a good sign.
It would be daft to think that no-one was going to find the new prices too much, and I expect there will be quite few, though I assume your 20% is a guess or based on your personal friends, so we'll have to wait and see how it pans out in reality. That said,
anyone who's supported the side regularly over the last three years is either a masochist or very keen so I'd guess that most of those who simply can't see their way to buying a season ticket will try to find the 'on the gate' price on an every other week basis.