It's actually much better for indie developers because it's completely free to build and ship something and see if market wants to before worrying about subscription costs etc like in Unity.
For Unreal from thier website - "A 5% royalty is due only if you are distributing an off-the-shelf product that incorporates Unreal Engine code (such as a game) and the lifetime gross revenue from that product exceeds $1 million USD; in this case, the first $1 million remains royalty-exempt." - much better than Unity's pricing. The > 100k annual only give you Unity Personal whereas you can full powered Unreal at much greater threshold.
