Unfortunately, as in paraphysics and parapsychology, the amateur wannabees give legitimate zero point energy quantum vacuum physics research a bad taint and the public is not able to tell the difference - especially venture capitalists. Equally, on the other side of the aisle, knee-jerk debunker professional skeptics some with engineering and physics degrees cannot tell the difference either. It's as bad as the wing-nuts in politics on both the left and the right.
From Robert Parks
"3. PATENT NONSENSE: CASE LAW ON PERPETUAL MOTION MACHINES.
When Joseph Newman was refused a patent for his Energy Machine he sued the
US patent office. Legendary US District Court Judge Robert Penfield Jackson
ordered Newman to turn his machine over to the National Bureau of Standards
for testing. It was found to be a motor/generator of a design vastly
inferior to those on the market. The case, Newman v. Quigg (Quigg was the
patent Commissioner) is cited as case-law giving the patent office
authority to reject perpetual-motion claims out of hand. The only effect is
that they are no longer called "perpetual motion machines." They are
called over-unity devices, or zero-point-energy machines. Coverage of the
Joe Newman case in Wikipedia is terrible. It's a remarkably useful
encyclopedia, but you need to verify."
http://www.bobpark.org