Been watching some videos recently. The most striking thing about the 'pros' is how high their stands are. It looks like those guys are 20 and 25 feet up. Is this normal?

I would estimate my average height around 12 to 15 feet. Am I too low?

Also, it would seem that to be effective at those heights you would have to have a very fast bow. I'm shooting an old PSE. If I go higher would I have to upgrade my setup?