1) No Rules - I just play whichever I feel like. Sometimes I stay a week with a household. Sometimes I play 4 households the same night.
2) I have a lot of households. Probably around 30. Basically, I play with most all the premades. I think around Cats and Dogs, I only pick 0-2 premade households to play. My premades seem to live forever, and they don't have many kids.
3) I've been playing like this for years
4) I use all the worlds.
5) The biggest drawback is University Life. I can't seem to leave the students. They do poorly in school and flunk out.
6) I play soap opera style. With giant complicated storylines.
For Example: Johnny Zest came back to the Landgraab household with his girlfriend Summer Holiday. Nancy hates Summer. And at first, Summer flirted with Geoffrey just to annoy Nancy. But Geoff and Summer fell deeply in love without ever acting on it. But then a vampire stole Johnny's memory, and Summer found herself suddenly single and very sad. Malcolm is now a young adult who is jealous of Johnny, swooped in during a romance festival and woohooed with Summer, getting her pregnant. And then the story just went on and on.