How much should I set a ticket price?

[CMSpunk]

I'm level 14 and have 32 for league, 35 for CL, 39 for cup.

I think as long as you find an optimum price for league matches so that you get +5 possession then +3 for CL, +7 for cup.

Sometimes you don't always get full capacity but still get +5 possession, in this case, bump your ticket up by 1 and , as long as you still get +5 possession, you will get more revenue.

[Tibi San]

max attendences per level...

The cap is equal to the stadium level that is one level below you, but with the large seat upgrade. Which calculates out to:

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

So, upgrade some of your other facilities as you upgrade your stadium. No advantage to having so many seats and not being able to sell any tickets for them.