New helicopter designs

There are several firms offering either plans for, or kits, for homebuilt
helicopters that have little if any supporting actual flite test data. Yet
apparently there are willing buyers out there willing to part with their
money for these subjects of marketing rhetoric. Even EAA gave some notice
of one of the offerings which adds or implies some credibility to the
offering. In this case, the aircraft has demonstrated flight but is not
mechanically capable of autorotation. Am I missing something? Are there
that many people out there that just believe the marketing rhetoric without
having seen a demonstration or having access to an independent test report?
I know that I don't part with tens of thousands of dollars just based on the
advertising.