Do halo cars actually work? The idea that a car manufacturer can produce an incredible aspirational car that brings buyers into dealerships to gawk at only to then buy something more practical off the showroom floor seems a bit farfetched. But if just enough of that magic from the halo car can trickle down through to the rest of the lineup, maybe it can work.  Case in point, Lexus has the incredible flagship LC 500 (and the LFA previous to that) and at the other...