Nor are OpenGL, and WebGL, and AJAX, and JSP. And you could include XML and XAML in this if you're being picky.
I don't think it'd be exactly productive if only the most technically capable people felt like they could even start to enter the industry.
Interestingly enough though, college hackathons are the only hackathons I've seen actually reward implementation over concept and the actual technical work done by teams over future potential.
The "extra" programming languages may not share the cause with that phenomenon.