Limit is like 6k for level three.

The best rule of thumb from July Fourth on ticket prices: "...worked out that best ticket price is 1/4 of the max value you can set it to on each level. and for any friendlies you need to set it to 1/5 of the price for your league/cl/cup games. "
Going to the lower price if it's not a whole number. Has worked for me!