Well, the standard answer is that I'm in business to do business. When about 30% of my gross income is tangled up with taxes and 50% in overhead, the business end of the repair biz is far more important than the individual repair jobs.
Many years ago, when I was still pretending to listen to advice, I was warned against over specialization. 40+ years later, I've noticed that my classmates, that entered into overly specialized areas, have either priced themselves out of the market, have had their specialty simply disappear, or have been outsourced into oblivion. I'm not suggesting that one should try to learn anything and everything, just not to become overly dependent on one particular skill. Were I still an RF engineer, designing various radios, I would either be simultaneously doing 3 peoples jobs for a tolerable pay, or standing in the unemployment line awaiting my government entitlement.
Not quite. I retired in 1983, but didn't know it. I had just been laid off from an engineering position and decided that engineering management and my abrasive personality were mutually exclusive. Since then, I've experimented with numerous businesses and professions, with the usual wide variations in success. Unfortunately, I'm getting sufficient old and tired that such changes and product ideas are not going to work well in the future.