I think you guys are just speculating… unless you start using it for a few months, then all you see is good stuff (still on paper) - the grass is always look greener on the other side of the road.
Regarding games royalty, I can only say this - most of the games you started developing will not make it through the end, sold in Steam etc. And if you make it till the end, only very little percentage of it make profit. So you will want feature rich and tool friendly game engine so that you can complete games as fast as possible, and looking good too.