The song says to “sign your name across my heart,” because after all, your sign company says a lot about you. The customer who has the first look at your business display will know something about your values, how much money you make and the reputation you hold.
They may judge you, fairly or unfairly, about the amount of status you hold in the community and whether or not your firm is worth its salt.
Because of these features, the signage business has been around for a long time. Almost no one is good at singing their own praises.