See also the information product startup ecosystem. There are online classes, conferences, bootcamps, and products whose sole purpose is to make money by teaching people how to make money by doing the same.
http://www.theverge.com/2012/5/10/2984893/scamworld-get-rich...
Sadly,the writer of that article has since left tech journalism and Salty Droid, one of their main sources for the article and a blogger who writes to expose the scam that that industry is, is now considered to be "an extremist" for his work by The Verge.