I suspect it's geographic. That happened to Ruby in the past, these languages get traction first in Silicon Valley (highest paid area for software) and then spr

I suspect it's geographic. That happened to Ruby in the past, these languages get traction first in Silicon Valley (highest paid area for software) and then spread out. It's also not very mainstream. Stuff like Java or C# has millions of developers in lower-paying countries that bring their averages down (I'm one of them :) ).