Epa, thanks for the feedback. We are in full support of the fact that web development tutorials need to be open and easily accessible to all. And around half of the content on our site is completely free. Most quality content, however, takes a very big time investment to produce properly, and it is often impossible to recuperate that investment through advertising revenue alone. The process is anything but easy, quick, or cheap (http://www.backbonerails.com/blog/how-to-create-compelling-t...).
Take Ryan Bates for example, I would be hard-pressed to find a good Rails developer who hasn't picked up a thing or two from Railscasts. And $9/month is nothing compared to the wealth of knowledge one can get for that price. We simply want to enable more developers like Ryan to produce quality educational content and monetize it, if they so wish, on Bitcast.