There are as literally hundreds of Internet marketing
business models. If you are just selling ebooks, you
are probably not tapping into the most lucrative ones.
Spend some time looking at what others are doing.
Some models are very creative. For example, one of my
friends who sells web hosting does it by building simple
websites. He puts these sites on the server where he wants
to sell the hosting. Then, when he sells the site, he also
sells the hosting creating a recurring income stream 
Here’s where I currently focus my efforts:
http://timic.org/OfflineSecrets
Willie