At level 38 my ticket prices are approx...

x3.5 level League
x4.3 level CL
x5.0 level Cup
x0.8 level FA

Cup is always much higher than league, a little higher than CL. FA is very slow to be able to increase and maintain 5% possession bonus, especially because you can face low level teams in FA.

Ticket prices are also dynamic within a season, you can keep increasing them as you move through to higher levels of CL and Cup.