That's why:
1. Unity - free version ( not to comparable to full version but something to test with )
2. CryEngine - full version for testing & non-commercial use
3. Unreal Engine - If I'm not mistaken - full version for testing & non-commercial use
I can download each of them, test them, check work pipeline, etc.
Unigine - I see that there is website where You can request Evaluation Kit http://unigine.com/evalkit/
but I think they will give it only to companies not single developers & people who want to learn ( but who knows ).
How I see it:
- hobbyist/amateur have small/zero interest in Unigine, that comes from lack of a free for non-commercial SDK;
- indie small interest in Unigine comes from lack of free SDK and/or lack of documentation/tutorials & probably licensing/pricing;
- small companies - could probably target Unigine but they already have well documented, used in at least class A+ games to choose from ( CryEngine, Unity, UDK );
- big companies avoid Unigine - because most of them already got big, massive engine.
So they are closing they own door from developers that's already on the market & from future developers that cannot access SDK & learn it.


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. Networking is extremely horrible in Unigine. DLC and mission pack support is non-existent. Modding aspects are non-existent. No dedicated servers for the community to run. No way to implement cel shading without Unigine Corp. writing it and supplying it with the engine's SDK. And they told me they won't do it. Basically everything I need for SS2 needs to be coded and either I have to pay for Unigine Corp to code it, or I have to buy full source license (we won binary license, similar to UDK, but less customizable) and code it myself.
