Because every used had the list of numbers, the number was already in use, and changing the actual numbers would require interaction with every user of the inve

Because every used had the list of numbers, the number was already in use, and changing the actual numbers would require interaction with every user of the inventory system. Then once word got out that you were willing to modify this system to suit one customer’s ego, it would be open season for everyone to make ridiculous requests (“we really like 69. Can we be 69?”)