Yes attendance is affected by your form, ur opponents Quality, the competition(u can keep it higher for Cup and have to keep it a bit lower for League).
At Level 9, i charge $10 for League, $11 for CL and $12 for Cup Playoffs.
I will increase the CL charges to $11 when the Round of 16 of CL starts and i will increase the Cup price to $13 for Semis.