Yet the most successful (in metrics of size and revenue) businesses, the "owners" get the F out of the way and focus on growing, managing, and running the business.
I started my business because I thought I could do it better or different, and that was 10 years ago... Do I actually produce much any more, not really. Do I miss it? All the time, but the business needs me out of production and selling/managing its growth. Can you just run out and start a business, yes but if you're not prepared you will just be another failure statistic.
To the OP, I applaud your Boss for learning the trade but and some point you should show him what he could accomplish if he hires experience and focuses on getting more business.
Our industry as well as most and the individuals working within it are as diverse and differently goaled as any. A small, single sign artist doing mostly custom, one off signs in a tourist village somewhere will have quite different goals and approach to their business as someone like yourself in a highly competitive, large metropolis.