As for the userbase statement, I'll bet you 5 BTC that if a poll were made in the general bitcoin forums about the motives driving individual interest in the bitcoin movement, the individuals interested in Bitcoins for black transactions would be outnumbered by the users interested in Bitcoins for either personal profit or ideological reasons by at least 3 to 1.  This thread sees a tremendous disparity of idealogy in favor of the black market simply because it is a thread about the black market Bitcoin economy, which uninterested parties aren't even going to take the time to read, much less post in.