yeah, its the prices and licensing fees.
I kinda sensed that, when I was reading about CityEngine in the 3d graphics magazine.
The same thing with the LawMaker game engine.
Looked pretty cool and I liked it, but got cautious and suspious when you had to contact the company about downloading a trial version and also for pricing. Tells me something that the price is too high and/or the product is over hyped.

Well, at least there is a trial version to use for CityEngine.