I think exits are much bigger question mark today then they were 6 months ago. Think of the exits Ning, and Brightcove have to get to make their investors happy. It's a daunting, daunting number.

Of course, Miller happily ignores his own advice. Spark just valued Twitter
— a company with no business model and no reliability — at just under$100 million, leading a $15 million funding round. This guy's almost as funny as his comedian namesake.