If a negative is not worth the time needed to bring it to life, then why bother? You should be able to tell if an image is going to work or not after the first few pilot prints. File it away and select another to work on.
I know in my early years learning to print, it took hours, days to get it right the way I wanted. Now, with plenty of experience under my belt, time and paper costs have been reduced, intuition takes over.
When you think about it, within the short span of exposing the paper, dodges, burns, flashing, developing, archival processing, toning, whatever your proceedure, photographers create their works. There are only so many variables in that process to work with. All the technique in the world will not save an image if there is nothing there to save to begin with.