Did you know that you can make money on Youtube without advertising anything?
Youtube has a partner program (revenue sharing) for videos that get over certain a amount of views. What revenue sharing is Youtube has Google Adsense/Content network ads that runs on your youtube video site and if visitors click the ads you get a revenue share up to 50%.
Here's the benefit of being a partner straight from the source.
Example:
and
Imagine most of your videos receives an average of one million views like these youtube super stars and get 50% of revenue share for Youtube/Google. Yes that can be 6 figures in the bank. Recently, there was a featured story on Yahoo about this but I couldn't find it so here is a list of vloggers making six figures on Youtube.
http://www.noobpreneur.com/2010/08/21/why-small-business-bloggers-should-learn-from-youtube-stars/
Therefore, you don't need to sell anything on Youtube, get your videos seen as much as possible and become a partner shared revenue and profit big time.