I am all the time coming with these overly ambitious stories that I can't realistically play out. In the last days before the release of Werewolves I came up with this outrageous idea for a multi-occult versus the humans storyline. It was elaborate, epic, and when I sat down to start, it was this instantaneous: "What was I thinking? This is insane, there is no way I can pull this off!". That wasn't the first time I've had that, just the most recent.
My limit for comfortable household size is 3 or 4. Beyond that it gets...the best way to describe it is this. When the household gets beyond 4 I'm like an 8 year old girl trying to walk a very large, excitable dog. It begs the question who's walking who? Who's really in charge in that situation her, or the dog? Me, or that house full of sims? In both cases, the ones who are supposed to be in charge are frantically trying to maintain some semblance of control and failing miserably.