I'd give you a strait answer, but do you realize that the Free Software Movement is much more widespread than royalty free photography or music?
Furthermore, among the crafts you mentioned, being a programmer is by far the less profitable one.
I'll untwist your twisted question. Honestly, why are you so worried about 'artists' and not worried about programmers?
No, the opposite. By 'photographers' we're refering to those who take advantage of their copyright. This excludes for example wedding photographers which are only payed to press the shutter but end up giving away their 'artwork'.
