Maybe they are spending their time conducting research instead of entering contests? I'm not trying to be snarky, but do you know that they're even entering the contests?
It's a little like asking why Electrical Engineering PhDs are not designing the new iPhone (probably some are involved somewhere, I know). Research and applications are two separate endeavors.
Furthermore, a competition only compensates the winner. That's all well and good for competitions, but sometimes science advances as much by finding things that don't work (and why they don't work) as by finding things that do.