I was a pro for 25 years. I loved public school shop classes as kid. I attended a vocational school cabinetmaking class but dropped out when I got a job in large woodworking shop. I learned a little in schools and more working for other shops. I learned the most when I had my own shop. The biggest lesson was build what is in demand,fast. Deliver the quality promised. Building to the quality promised is often not the best quality in my opinion,but getting paid comes first.
I was able to make a good living by doing all kinds of low class work. Tons of particle board store fixtures covered with plastic laminate left my shop. I loved getting paid well for low prestige jobs. Sometimes I'd get a job that was fine furniture but per hour it was often less profitable.
I had learned many tricks to keep customers happy. Often I would quote 2 prices. Production grade (to match mass produced ) and furniture quality grade. 90% of residential consumers chose production grade after looking at samples. 50% of my office furniture consumers went with furniture grade and paid the up-charge. Ultimately I chose to market mostly to the office furniture trade.
I agree passion for the craft is important. Passion for a profit is WAY more important if you want to keep a business going.
"Whether you think you can, or you think you can’t - you’re right."
- Henry Ford