That's for 1 game..... so you don't have much faith in your talents to produce a title which sells many units then !
It's totally free if it's non-commercial.... so free for free games...etc...
That's peanuts I think !
If I wrote a game with this engine that I wanted to sell, I'd expect to make a little more than $399 ..... otherwise it wouldn't be worth the effort, would it !
$400 is squat for a commercial game I was just commenting on past news where the "free" version has a watermark that everybody sees all throughout it's use, and is unremovable, legally. I guess they changed that