As a forty year veteran who started the old fashioned way, paints and brushes. I'm in business to make money any way I can. The more I have to offer the more I can sell. It comes down to equipment and personnel. My role is to delegate, run the business and marketing side, and I personally handle each and every design. We design the logo, sell the business cards, embroider the hats and shirts, letter the vehicle, make the business sign, install the work.
We fabricate the signs in house, i.e. sandblasted, carved, painted, digital printing, laser, pinstriping, air brush, gold leaf, pretty much can handle anything that comes through the door with cash, credit card in hand. Gets tricky sometimes but the key is being realistic about your time management. Make sure you can deliver in the time promised. You don't want a bad rep for not being reliable. Better to turn down a project that you know can't be done on time. Customers will appreciate your honesty. Oh forgot to add, no shame in outsourcing. That can be the smartest money you will ever make.