Good Evening,
In regard to RAP's question, I worked with a St. Louis stock agency for a number of years in the 1980's and into the 1990's. Since I was otherwise employed, I had serious limits on the time I could devote to shooting; generally, I covered expenses and made enough to add an occasional piece of equipment. Although I didn't encounter any "horror stories," the market, as Ralph notes, did change. My agency no longer exists, a victim, I suppose, of the glut of "free" images available on line.
Konical