But attendance for me isnt about the $, it's about the bonus possession. I have my ticket prices at my League level, cos I don't feel like doing math, but I am reliably informed that if you divide the max amount by 4 and set it to that you should have a full stadium.

Here's capacities to get "full" attendance:

L1 - 800
L2 - 2,500
L3 - 6,000
L4 - 11,500
L5 - 19,000
L6 - 28,000
L7 - 40,000
L8 - 53,500
L9 - 69,000
L10 - 86,500
L11 - 106,000
L12 - 127,500
L13 - 151,000
L14 - 176,500
L15 - 204,000
L16 onwards - 260,000