I always find those numbers odd, since it implies that all programmers create some value. Bad programmers not only don't produce much, they introduce bugs that

I always find those numbers odd, since it implies that all programmers create some value. Bad programmers not only don't produce much, they introduce bugs that others need to fix and they need lots of help, hand-holding, and management effort, which draws down the productivity of others. 28 times better than a negative number isn't good at all!