To the publisher, if copyright was to terminate upon death, would the publisher then pay less for the works from a 70 year old author compared to a 30 year old?

To the publisher, if copyright was to terminate upon death, would the publisher then pay less for the works from a 70 year old author compared to a 30 year old? Or one that is fighting cancer or one that has sky diving as a hobby? Is the value of the work of the author to be measured against their remaining lifetime?