[vram22]

Yes, I was wondering the same thing. Some guesses: some people may not be comfortable with the somewhat un-conventional syntax / semantics (e.g. no operator precedence, just right to left or as they call it, left of right :) (I'm fine with it myself), or might think you can only get jobs using kdb+/q/k in big cities like New York / London, and may not want to move there. Possibly low market demand (compared to mainstream languages), although high comp, may be another reason. Also people may think you need finance knowledge too, and may not have it. Those are some guesses, that's all. Interested to hear if anyone else has some ideas on this.

Edit: Just saw beagle3's comment after posting mine. Some interesting points there. Still wonder about the non-tech factors though, as listed in above part of my comment.