I think we Indians in India are risk averse as there is no feeling of security. Plus there is too much pressure from social circle to be successful; so most of the people choose easy and tested ways to become successful rather than taking paths which are filled with enormous risks.
Also, I have seen many of my frineds doing great in their business. But unfortunately media does not report those people as they are mainly in traditional business. But if someone starts up a small compnay in bay area, they will definitely get some recognition in Indian media.
We dont have enough statistics which indicates how many people start their own and fail (both in US and India) to come at some conclusion. Plus dont forget the reality that people who migrate to US are highly educated people and we should not compare them with average indians.