And to write to the Sci Fi channel about Battlstar Galactica et al, use feedback@ here:
http://www.scifi.com/help/feedback/
Remember, sounding intelligent will make an impression. Insults and threats will not. Explain that you WOULD spend money on their shows via iTunes, and that you won't by other means.
As a previous SCI FI employee, SCI FI has little say over this decision. NBC has an entire devision for online and technology initiatives. While a message might get passed along, the .com guys don't have a lot of say in this issue. I believe contacting NBC-UNI or NBC proper is a better approach.