many people will disagree i'm sure, but i see absolutely no point in having a giant arena -- even up to & including Div II.
to state the obvious, 1000 seats filled at $16 nets the same revenue as 2000 seats at $8. zero difference. & if one has so many bleacher seats (or any type) that even with minimal prices they're still half empty, what's the benefit???
half empty arena -> fault in arena pricing. You could make it also with small arena, but should avoid it ;)
Your example, thats right mathematical but try to put in 3000 selled placed at 8$ and you are closer to the reality and then you see the difference.