Hey Ed,
Most musicians/writers are part-time, sure there are long periods of inactivity but that's just the way it is in the music business.... for example, 5 years of success making good money as a writer, followed by 5 years of hardly anything. Point is, you don't have to be a celebrity to be respected as a pro. Therefore, at least half of about 94 percent are not just hobbyist, they are very experienced, talented professionals who always keep options open for whatever paid opportunities that may come their way. Others make opportunities happen by getting out and performing, and/or for example, submit their works for placement in film.
Many people perceive artists/writers indulging in leisure, the same could be said for sculpture's and graphic artists who enjoy creating works of art -- considering the costs (gear) and time (labor) invested, surely it's wise to be open to good opportunities and get paid.
Above said, it does not mean that these works should be given away freely whilst torrents and other music sites owners make millions --- at the end of the year, most musicians/writers have not made enough to pay living expenses. That is why I publicly gave a more informative post to whoever happens to read it may find useful, keeping in mind, this site is open to anyone including non-registered forum users - visitors.