Too good to be true? It seems the guy has been talking in Ted too (<a href="http://www.ted.com/speakers/justin_hall_tipping.html" rel="nofollow">http://www.ted.com/speakers/justin_hall_tipping.html</a>). They make quite remarkable statements, but at the same time they are quite vague. At least they are not promising too much too soon nor do they refer to some "official" research that would make them right like some more suspicious companies always seem to do.