It's always nice to get a little extra but if they keep doing that they could lose their job due to theft. When they have their yearly inventory the system will say they have x amount of each fabric they carry. If it's not counted and they have a high shrink you can bet they will look into it. Wal-Mart does concider that theft and they will get fired. 3 inches extra per cut does add up. It also causes prices to go up due to the shrink.
Just sayin...