You probably didn't take enough pop-psychology IQ test phone screens and write a long enough essay about how well you did in high-school math. If you had said you had proved the Collatz Conjecture when you were fourteen he probably would have listened.
At least that's the impression that I got from their interview process.
Yup. I tried to bounce the idea of Mark Shuttleworth when I last interviewed him, but he wasn't interested.