How far are scientists willing to go to publish their rejected articles or scientific reviews?

I am wondering how many papers are sleeping in a computer file because they were rejected or not completed.
One would say very few, since a paper "has to be published".
Asking 9 university-based physicians, 5/9 reported to have 1 to 3 papers into their personal files...that will never be re-submitted!

Would be glad to hear from a "larger size", do you have unpublished papers?