Boulton helped found the New Street Theatre in 1774, and later wrote that having a theatre encouraged well-to-do visitors to come to Birmingham, and to spend more money than they would have otherwise.
Boulton hjalp til med at grundlægge New Street Theatre i 1774, og skrev senere, at det at have et teater tilskyndede velhavende besøgende til at komme til Birmingham, og bruge flere penge end de ellers ville.