What do you do with your Simoleons?

I spend it on expanding and improving my sim's houses. I always remember the intro to the first sims where the house kept getting new additions, so that is usually the first thing I do when my sims start amassing money. I also use master controller sometimes to give some of the poorer sims in my neighborhood some of my sim's extra money when I see the story about sims not being able to pay their loans or being in danger of having to move :'( Unless it is a sim I dislike. Then I just let them suffer.