Monty Python started a YouTube channel with tons of their sketches streaming for free. The included links to their DVDs at Amazon. The result was a whopping 23,000% increase in sales.Um. Yeah. If you introduce people to stuff, they will want more and most people don't mind paying. It's when you wage war with them that they go for free.
I can't tell you how many albums I've bought because the groups music was up for free on You Tube. Now You Tube has taken that music down, which means I won't be buying as much music. WIN!