For a long time, every serious luxury car brand wanted a halo car. Not because it would sell in meaningful numbers, but because it made the rest of the range feel more desirable by association. The Audi R8, the Porsche 918 Spyder, the BMW i8 all played this role at different points, machines that most buyers would never own but that gave the brand something to point to when it wanted to signal what it was capable of. That logic is getting harder to sustain, particularly in China.