Regret is a fantasy about what could have been. There is, of course, no guarantee that had we ghostwriters majored in business or engineering that we would have become rich and famous. But, of course, those fantasies pop up when we read statistics about starting salaries for new college graduates who majored in computer science, various niches in engineering, and finance.
FORBES reports that the National Association of Colleges and Employers lists those majors which are getting newbies annual compensation in the 50s and 60s. None of them are in the humanities. Moreover, one wonders how those who had majored in English, History, Religion, and Philosophy are faring even in nailing down a job.
Like many ghostwriters, I have tried other lines of work. Nothing worked for long. I didn't like managing. One the novelty wore off I didn't like identifying and apprehending miscreants in retail. When I was a probation officer in Detroit, I don't think I influenced anyone to adopt a middle class way of life. I had worked hard to get admitted to what was at the time the best law school in America, got there, took a look around, and accepted a lucrative offer to return to ghostwriting/speechwriting.
Although ghostwriting pays well enough - I once had a This Old House + a beach cottage - none of us will make the really big bucks. And, unlike speechwriters who are achieving fame, we sign ironclad NonDisclosure agreements (NDAs) to be invisible.
But we love to take on the voice of others. We are actors with more steady work. Work has never been that slow that I had to wait tables. Actually the only economic adversity I have encountered occurred because I was between jobs since I had tried out another field.