Selling them is one thing ......... and good luck to you in doing so.
However, what goes around, comes around!
So be careful in getting rid of the rulers, for fear that you want the same one next week!
Another thought .... a good glass cutting shop could re-cut them accurately for you.
With the duplicates, you could re-shape to a new size that could be quite usable.
And/Or you could get rid of chipped ages, by cutting those off.
I did that a few years ago when I needed an off-size square ruler for a project.
The pattern said to use a regular 6-1/2" for measuring 5-1/4".
I had an extra 6-1/2" re-cut to the 5-1/4".
The cutting went a lot smoother and quicker .... and no fears of miscutting at the wrong size.