Lots have been done, we now have culling options so I'm going to lock this.
Feel free to open a new thread if you still have issues with this.
I did some research earlier today, and discovered this:
At 3 AM in the morning, all new sims labeled Not in world disappears, like we already know. I went inside the household manager, and counted 6 households labeled Not in world.
I now waited until about the middle of the day, about 3 PM in the afternoon. Now I once again did some counting. I counted more than 30 households labeled Not in world. The game is apparently generating shitloads of these households, only to trim down the number of sims by night.
To confirm this habit, I counted again 3 AM in the morning, and the number was now down to 5 households Not in world.
Also, there is some funny choice of the nature of these families. There's always some kids among these Not in world households, but they never have heterosexual parents. :P Nothing wrong about gay parenting, but it's not realistic that they dominate the parenting population.
