So I decided to experiment on docstoc for some low and medium competitive keywords with pretty decent search volume. I submitted several documents and started building links to it.
Within a month many documents were dominating the first 3 position on google and started generateing sales.
And finally the disaster happens. Docstoc deactivated all the outbound links, which means none of the links in the documents were clickable anymore! The situation still continues...
The lesson learned is that, do not put all your hard works in someone else hands. They can change the policies or take down your sites at any time. This goes true for everyone completely relying on blogger, squidoo, hubpages etc.
So get a domain and hosting, and put all your efforts in ranking your OWN sites higher!