I like the festivals who ask me to pay 10-15% of my takings. I dislike greedy festival who ask extortionate pitch fees up front and don't spend the money wisely on advertising. It's the 'we've got your money, we don't care now' attitude.
I vote for festivals in back gardens; small, intimate and back to their roots. To quote the Aviva advert 'you need to take out a mortgage to buy tickets there days'
Sal