Sign industry is an extremely demanding sphere of business. Every order involves creating a fairly unique product which then has to be given to a client in the best professional way. There are way too many stages in a sign production where a single mistake can lead to a reprint.
When this happens in your store, you are stressed but you just redo that sign. Do you as a sign shop owner want a ready sign being ruined in front of your customer's eyes? The answer is obvious. Neither you nor we want this.