I also suggest that instead of pricing fabric by the yard, price by the pound. That way it does not matter what the size and scraps sell for the same as yardage. One yard is usually around 5 ounces. All you need to have or borrow is a baby scale. A local estate did the room full of fabric this way and anyone can weigh but there are issues with measuring, like having the right sized table and having people who only want part of something. This estate did not have to measure anything. It was great. I went back twice.
Post the method in big big letters and it even helps having two scales (borrow them) so someone can tell if they have enough money before coming up to the pricing counter.
I just got thru sorting all my fabric and cannot use anymore until something goes out the door. But at least I halfway know what I have.