The 959 was a money pit, but they did make the CGT.

(the GT1 does not count, it's a homologation special)

Supercars don't need to be profitable on their own, as long as they work as a halo car. It's an investment. Today's 10-year-old is tomorrow's customer.

Every generation needs an icon. The 911 is not exclusive enough to make boys dream of buying a Porsche when they grow up, rather than any other sports car brand in the same price range. So yes, Porsche does need an out-of-this-world supercar once in a while.