My assumption is that he's a guy with an idea, mediocre programming skills, ok storytelling skills and ok 3D skills. But the idea attracted a lot of patreons. Giving him a lot of money won't make him a better programmer or better 3D designer, so he'll be slower than a real programmer. And let's face it, hiring the right people is a skill as well, that he may or may not have. From my point of view it's understandable to be jealous of the money he makes, but expecting more output because he earns a lot doesn't make logical sense. His skills won't double because he earns double the money.
Having said that, I find his releases enjoyable. If he makes tons of money from them, more power to him. I don't pay him, so no skin of my nose.