Would it be better for an investigative journalist who specializes in the oil industry to partake in the oil industry, or strictly comment? Would it be better for, say, an individual reporting to congress on a certain industry, healthcare and such, to take part in that industry, or strictly comment?

Seeing as TC is his biggest investment, and the main purpose of the blog is to deliver unbiased, somewhat investigative, pieces on the startup sector, it'd probably be in his best interest to pull out of companies that might bring about future accusations of Michael and TC being biased.

I guess you really can't please everyone.