Because Mazda enthusiasts (aka rotorheads) love them, and they are actually really good sports car powerplants. But as other people have mentioned, they have s

Because Mazda enthusiasts (aka rotorheads) love them, and they are actually really good sports car powerplants. But as other people have mentioned, they have some downsides, pretty much all due to their hard-to-seal and oddly-shaped "combustion chamber". But nothing drives a following like an unusual design with inherent impracticalities (Cf. 45-degree V-twins, late-90's air-cooled Porsches, and Lisp ;).