I have over ten years experience with Unreal, so the cost of switching engines would be very high, and must offer something irresistible in return.
Regarding your second question: Unreal effectively has no licensing fee for most developers. The engine is free, you get access to the full source code, and you pay a 5% royalty only after you have made $1 million gross revenue.
Regarding your second question: Unreal effectively has no licensing fee for most developers. The engine is free, you get access to the full source code, and you pay a 5% royalty only after you have made $1 million gross revenue.