How many Sim projects/stories/families do you maintain or creating?

I don't really play with a specific story, challenge (though I've tried a few and abandoned them after a session or two of playing), or project in mind. I get bored so quickly if I already have everything planned out from the beginning. I like to just go with the flow of what sounds good for my Sims at the time.

Right now I have around a dozen different saves I play though.