My policy is simple: I am a photographer, and my interests are to make my pictures available to you, my viewer. I only collect web server statistics and logs that are used to ensure proper running of this website. I do not use the logs I collect to market to you, and I do not sell contact information to anyone.
The only time I would share your contact information with a third party would be to facilitate shipping of a piece in conjunction with an order for a print.
Short and sweet. :-)