Well, yeah, they didn't sell many as I suppose they were more of a luxury purchase than a serious riding bike. But they looked cool so people bought them for posing/cruising.
I for one distinctly remember lusting after the '95 model hanging on the wall at Kingston Cycles.
I've owned an A'Ha which is a very similar model - but wasn't sold on its BMX components. Hence I've always liked the idea of converting a standard Kona MTB frame to a Humu lookalike as it would mean you could run a standard 135mm back end and standard bottom bracket - opening up the range of the bike