Buyer beware.
Reminds me of those "GET RICH IN (whatever)" shows on TV. The 'inventor' makes more money off sales of the book, the tapes, the course, seminars, than any of the 'investors' do with the (whatever).
OTOH, it is simply a matter of time until someone finds a more efficient method of generating power. The trick is to recognize it when it happens.
If we truly desire to explore 'space', we have got to come up with a better 'power' source.