It requires paying for usage above a level, but is symmetric and permissive and makes future costs predictable, ie prevents the copyright owner from pulling the rug out from underneath you after you've adopted it. The software that I intended this license for never gained traction (so completely that no-one ever told me "i'd try it out if it was open source") so it's untested.
But if a popular software used this license, would you be willing to use it or contribute to it ?