That's a really good point. For the last game against Sheffield, it was £15 into the East Stand. If/when the South Stand isn't in use, then it should be South Stand turnstile prices for the East Stand.... and the club should be saying that now....
I've bought a season ticket for next season (40 years on, old habits die hard), but wasn't offered any "bolt on's" when I rang. Tbh, from what folk have said, they're hardly at a discount anyway?
Atmosphere (aka noise via chants/singing) is vastly affected by the architecture of the ground. The noise in the Scrattin' shed at Thrum Hall was deafening, but this was helped by a fairly enclosed space. Big grounds with big stands (and the Shay isn't small) need vastly more numbers of folk making some noise to make it "atmospheric".
It's a downward spiral at the moment, but there can be a bit of a revival both in numbers (small) and atmosphere (bigger) if the team can a) win games, and b) play with some passion and style next season.