depend on stadium capacity
level 6 .. price is $6
put it $7 and despite am in top2 my last game noticed had 12.5/13k which give me 4% only possession
so reduced it to 1$
why? bcz i have 13k stadium, was easier to fill it with $7 with 7k stadium
why reduced it? bcz is stupid to lose 1-5% possession for extra 13k !! which is really peanuts
so my advice stick to minimum .. not worth it in lower levels .. may be in level 15 and more where match day revenue become really big