The sale of photographs is something that many photographers misunderstand. For example, they will think that a lot of money is paid for that, while in reality, only a little is paid for such sale.
This is the kind of mysterious of myths that surround Stock Photography and Photostocks. A lot of outsiders will have a wrong view on this issue, but that can be understood. However, a photographer, especially a professional one, should be able to understand the full nature and practice of the industry.