Why? The guy is far from stupid and he preaches to the segment of the US population not generally interested in browsing this forum.
He has a extremely poor reputation among a large pool of potential donors, employers, policy-makers, academics and 'serious' people. If you want your ideas taken seriously he is not the figure to have introduce them to the general public. This is true regardless of what his reputation ought to be.
From the final chapter of his new book Cowards, titled "Adapt or Die: The Coming Intelligence Explosion."
The citations for the chapter include: