To answer your question. Quoting from an email of a German developer studio`s CEO to me:
Quote:
Basically a game like yours is a pretty cool thing and has financial potential[..] But one thing does stomachache to me, and that`s the A8 Engine. Especially publishers are often very sceptical with games done with that engine [...].

It`s the development speed of the engine, the Windows-only thing and the high effort you have to invest to make a great game that makes the Acknex Engine increasingly uninteresting for serious game programming.