This license isn't about restrictions on usage, it's about restrictions on identity. It's deeply weird. Even stranger, despite the insistence that "fair" is a meaningful term in this license, the definition "A fair price is a fair market price for a fair commercial license." tells on itself. The clarification that it means "more than one customer not affiliated with the licensor has paid that price in the past year" at first glance seems unsatisfiable (under the license), because somebody has to be the first to pay that price, and at that point it wouldn't be "fair."
edit: In trying to ape FOSS licensing, it has confused itself. You don't have to ape FOSS.