Perhaps the fee would be a base per times renewed plus the worth of a portion of the total reported wealth that the IP has generated over it's lifetime, instead

Perhaps the fee would be a base per times renewed plus the worth of a portion of the total reported wealth that the IP has generated over it's lifetime, instead of just since the last renewal. So if you've made sixty thousand dollars over the first twenty years, you owe six thousand for the renewal. If you've made ninety thousand dollars over the next twenty years, you owe ten thousand dollars plus eighteen thousand for the renewal. The base fee scales to make it feasible for low earners, but increases to prevent copyright abusers from perpetually milking an unused IP like how Harmony Gold did with Robotech/Macross for thirty eight years.