Successful blogs are already doing something for the masses. Becoming a registered company enables you to do more, get more people, pay them professionally, get more content out. Therefore doing more for the masses. Even in my case, I've been told that one of the reasons a couple of companies (like Intel) don't interact directly is because my site is not a part of a registered pvt. ltd. It does play a role. Like how domain names, professional email domains, professional b*****ng, business cards, professional setup, etc. does. It happens in India. Just not that often compared to the number of blogs start everyday. But then, only a handful can achieve success in blogging.