I see that side of it and maybe some of it's true, but I'd say more likely than not he just wants all the money. I mean, if Patrons aren't going to force his hand to increase update speed then why would he?
His art style isn't special or anything and I'm sure he could find someone who could do an identical job that works even faster than he does. It all comes down to greed though in the end, and if people are willing to wait for his snail paced small updates then hey, he should do it. You know the saying... "there's a sucker born every minute..."
If save compatibility ever comes, maybe people will start to clearly see how small these updates actually are, and how absurd it is for someone to be making that much off so little content. It's straight robbery from foolish people really. I stopped pledging to DC a while ago, and have no intention of ever doing so again. Just felt like my money was better off being given to other creators who deserve it more.