You should consider featuring a free preview somewhere prominently on the page. Most people won't think to click your RSS button to find them. I know it says "free videos" right there on the button, but it's still very easy to miss.
Thanks, that's a good point. In the beginning, when I didn't have a lot of episodes, the free ones were easier to find. I'll be adding a quick way to see all the free videos on the site soon.