Mark Loundry's column in this month's issue of The Digital Journalist is worth a close read:
"The value of our work lies not in the fraction of a second that it takes to record an image but in the value that the client is getting from it. For example, a large-circulation magazine might charge more than $100,000 for a full-page ad. A smaller publication might charge only a fraction of that, but it's still going to be in the thousands of dollars. Since the magazine itself puts a high valuation on its pages, it makes sense that you do the same with the images that you're supplying to fill those pages."
No matter how much you charge for use rights, the publication that uses your image is always going to make more money from it than you are. So don't sell yourself short.
Photo: ©1991 David W. Sumner