If X in death + X years is big enough, then age becomes less of a factor. Most IP's value drops as time goes on. In the majority of cases, after 70 years the va

If X in death + X years is big enough, then age becomes less of a factor. Most IP's value drops as time goes on. In the majority of cases, after 70 years the value of IP is approaching zero, a further 10-50 years dependent on the creator's age won't have much more of an affect on the value that IP can create. I agree X years after creation sounds like a much better system though.