Sometimes, depends on why I'm playing a particular game.
Sometimes I'm just focusing on trying something new. Sometimes I'm developing sim families to use in unpopulated worlds. Sometimes I'm redoing a world (I am almost never satisfied with things as they are, I like to edit or "improve" - sims, lots, worlds). Sometimes I just want to set up a situation and see what happens. In those case I usually don't generate little back stories.
Other times I do like to incorporate little incidents of the game play into a story, especially if I am playing a "story". One example was when I was writing/playing my
Girl Who Cried Wolf story. I developed details in one of the character's back story to fit the title of the book she was writing
Driving with Duckies.
Even when I am not writing a story I will incorporate things from game play into their back story. I often play a young adult or teen male sim to develop his skills, career and back story in one world. Then save him as a household to be brought into a new game started with a child female sim when she reaches young adult, merging their two stories.
