Seems :
- Lot of work for many platforms , specific bug correction , Android specific optimisations ... too much work specially if you have to complete the desktop PC/Linux with missing features and all bug fixes.
- Free and complete versions or cheap ones with prooven tools, extensions, optimisatiosn tricks for mobile
- Small demand on Leadwerks 3, kickstarter just shown lot people wanting Linux/PC versions
Companies with mobile full time dedicaced people to optimize and bring features , correct bugs that makes all difference and make them able to bring 2D or visual programmign language, new tools because they only work in mobile.
For money, indeed they make lot of money to propose expensive PRo version for each individual mobile device.
Major part of mobile games use 3D without big shader features , but with skilled 2D and 3D artist behind, your engine need to be able to run well on low mobile and be easy for 3D artists and game beginners to pick it up and be able to make simple games (easy language, visual script, easy commands, lot of tutorials, plugin extensions, sample projects of any genre)
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Mobile is a big platform : Nintendo has come into it finally , Square Enix came from some good time now, and other big companies are already present. So it's growing a lot , even in software industry where all companies genre begin to propose mobile solutions even thtought SAAS cloud.