It seems like the biggest no-brainer investment you can make. The documentation may be the difference between a huge amount of people sticking with the engine or moving on from it.
Epic don’t really make so much money ( compared with when you had to buy the engine ) from people developing using the engine. So there’s much less incentive to have good docs, I would say…
It’s free. Unity, for example, isn’t.
The issue I see with that line of thought is that Epic would perhaps make more if the documentation and samples were more useful for production. The more projects Epic can facilitate getting to the end the better off their bottom line will be… They even say it in their catchphrase about them succeeding when developers do yet their actions arnt representative of the marketing. I also think thats why Unreal Engine channel has so few subscribers, its mostly marketing when people watching would probably already be sold on using the engine 
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