I gave you an example, I knew personally a guy doing just that, and made a life out of that ("selling hype" I call it, but he had the ability to become *genuinely* enthusiastic about it).  Hell, I've been doing it myself for totally different technology, totally independent of anything from the industries doing it, just because of youthful idealism.  I didn't even want any connections with said industry, because it would put a potential shade on my honest enthusiasm for it, people thinking I was a shill for them.  So I know how it goes.  I most probably acted as a useful idiot back then.