So the basic premise of your writeup is you are trying to judge how smart people are based on what they submit to this site and the content of their comments. I am not so sure I agree with that. It seems to me that starting a company requires dedication, technical smarts and technical vision. All that a good comment or submission tells you is that the submitter spends a lot of time surfing the web and is articulate. Unless you have solid reasons to believe that the two sets of qualities are strongly correlated, I am not so sure you should be even consider using this as a metric. Having worked in Silicon Valley for some time now, I can say that some of the smartest people around here have inadequate language (and by implication -- commenting) skills. Quality of people's resumes are likely to provide a stronger indicator.