Well, hey! Last I heard - It is a team of 5 people: DC, 2 posers, 1 coder, 1 writer. ( I could be off - but going by what's been presented in this thread)
Your math is off for monthly (but about correct for annual) - it maxes out at 80k USD per month gross (currently) - after Patreon's cut, currency conversion fees, credit card processing fees, national income tax, website hosting, software and app costs, other technology purchases/repairs/upgrades, accountant fees, other expenses related to running a business (before paying 4 other people on contract) - you're looking at about 35k USD per month. Now from that comes salaries, etc etc etc etc.
For a small business of 5 staff members - a $1 million USD annual income isn't unheard of after 6 years of work. In fact, for a semi-successful small business - that's meh. It would have been considered "average" in the US
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. Today, it would be considered underperforming.
But he's doing something correct. He's the #1 Adult Game Creator on Patreon by subscriber numbers - and has been so for years. Where others have flamed out, petered out, abandoned, etc.
It's been covered dozens of times in this thread if you want to read about it. First DC started coding the game when he probably knew less than you do now. Then, over the years, he's had people come in and code the game - mostly adding to the code, not fixing previous code, necessarily. It's a jumbled mess and that is why about a year ago, DC decided to have ONE person go through 6 years of code from various people within the game and bring it all into one style, better optimizing the game and have it ready for future development. This, rather than continue piecemealing it. At the same time, DC decided to take the game toward the 16:9 aspect ratio (away from the 4:3 standard at the time he started developing) for mobile players and to give the city more locations without needing more than one map screen. yada yada yada yada.