[jimmcslim]

Possibly because they cost an arm and a leg (or at least that's the perception) and are therefore out of reach of most firms, apart from large utilities and hedge funds, and the language looks like line noise.

Yes, I know there is a free version, but limited to 32-bit only (and probably non-commercial?).

EDIT: 32-bit version can be used commercially.

[deathflute]

Agree about the cost. However, I would think that a wider adoption would eventually bring the cost down and perhaps even spawn a bunch of related open-source projects.

As far as readability is concerned, q(KDB+) is far more readable than k(KDB). Also, nobody stops you from adopting a coding style that is more readable. That is what I personally do.