To be honest Peter, I was getting burned out on it. I did get to meet many great musicians, some fairly/very well known. I still have some past clients that will only let me work on their gear but it was tough being president, laborer, buyer, sales, etc all wrapped into one and still have a life too and I was never at the point where I could hire someone to take some of the load off.
My wife was a great help on the financial end of things but it was getting harder to repair a lot of the more modern stuff what with SMT (Surface Mount Technology) components. My 62 year old eyes just don't see what they used to be able to see and the specialized equipment required to repair this equipment was out of reach for me cost wise.
I like what I do now..still an electronics tech in a different field (very sophisticated electro-optical equipment) and I get to have a life in the evenings and on the weekends, something I never really had running my own business....and I still repair sound stuff, but now I can do it pretty much on my terms.