It's not that.
I think that the majority of people think that's a lot of money....
But at least he delivers in the end, and yes... There are a lot of developers on this site that "should" make more money, but i guarantee you that with almost all of them their are legitimate reasons why they don't.
So, i rather have that this developer takes 6 months for 1 update and makes a shit ton of money and actually delivers, then the bulk of other devs that promise you fairy-tales.
And to end it...
What is much money ?.
Soccer player in The Netherlands transfers for 80+ million Euro's to barca.
Baseball Player in the USA is going to earn around 120 million euro's in the next 8 years.
Stephen Curry makes around 40 million dollars every year..
So what's is much money in these days....