> I would like to have copyright end once your earnings from a certain work exceed some multiple of the expenses that went into making it by a certain factor...

> I would like to have copyright end once your earnings from a certain work exceed some multiple of the expenses that went into making it by a certain factor... One of the reasons is that it would have a chilling effect for speculative investment in creating works. What if I'm a movie producer getting an average of one hit for nine flops? I need the profit from the hit to subsidize the flops.