Yeah, compared to the top five adult game devs, Decent Monkey's definitely not playing in the same league, but neither is anyone else. That's like comparing yourself to a billionaire to figure out whether or not you're a successful businessman. It's just not a reasonable standard.
Decent Monkey has a game which has sustained development for five years, so far. A lot of the games on this forum are abandoned before they make it that far. And, while he doesn't publish his earnings, it's probably safe to assume that he's bringing in at least $5k monthly. Honestly, I would think that it's closer to double that. Even at the lower number, we're talking about $60k a year, which is higher than the median annual income for every nation on earth, with the exception of the UAE.
Well, most of us want more money, no matter how much we're making.
Could he improve his status updates? I think so. This business of not sharing any renders until the progress meter is around 80% is a rather negative development, in my opinion. But I don't think it's anything critical. He still seems to be doing fine, support wise. And the new versions are still coming out in a timely manner.
As for your suggestions on how he could improve his promotions and supporter interactions, I'm not arguing against any of that. I was just baffled by the implication that he's not a successful developer.