Can you imagine? APL is an amazingly powerful language. It's easy to write nearly any mathematical function in it. What if it was faster than every other mathematical language? It would probably dominate the market overnight.
I don't think it will ever dominate the market - some things such as FFI remain weak points compared to C.
Plus a lot of what makes Mathematica good is that they have specific algorithms that they've optimized quite a bit, for things like computer algebra &c.
The 64-bit kdb+ On-Demand Personal Edition is free for personal, non-commercial use. Currently it may be used on up to 2 computers, and up to a maximum of 16 cores per computer, but is not licensed for use on any cloud – only personal computers. It requires an always-on internet connection to operate, and a license key file, obtainable from ondemand.kx.com
But yes, I do agree that the 32 bit instances have limited use, as they can't be used in for-profit projects.