Not a bad idea, ploppy.
The number lines on books usually denotes the first printing/first edition, etc. It's used by collectors to determine what a "True" first printing is.
In the grand scheme of things, they print the first run as "First Printing First Edition 1" and then go up from there, up to (1)0.
When they do the second printing, some typos are fixed, other bugs squashed, that sort of thing.
I look at as equal to a version number in software. If you're going to squash a bug, may as well update the version number.
