First: this is the side project as it came later.
Second, as has been said quite a couple of times, the income for two devs this game generates is not as high as it seems to many, since we're only seeing the income before cuts and taxes and costs for a decent standard of living in Switzerland are quite high. While outsourcing some work would certainly be possible, a real "hiring of freelancers" is probably out of the question.
Well, one is 143 renders per month, the other 167 (rounded numbers), not that much of a difference. However I do not agree that "number of renders" alone is a good indicator of the work getting into a game. You can set up a scene and let the PC do the hard work of rendering - or you can spend quite some time fiddling with the scene first, making sure that the pizza MC is eating isn't flowing in mid air, that there is something on the table in the background so the scene looks more lively and so on, and only then start rendering. And maybe do multiple renders for the same scene because you want to see the resulting images if you put the camera a bit lower and to the right in the final product.
Anybody might think that this extra work ain't worth it, at least past a certain point, and that's a perfectly fine opinion. Depending on the "certain point" in question I think we would all agree with that. However, I want it to illustrate that "low render number" doesn't have to equate to "not working on the game as hard".