What do you do with your Simoleons?

If I'm playing in a custom world I populated with my favorite Sims, I usually have the active sim buy lots of cars and go around gifting everyone in town. Great way to keep simoleans down and I enjoy seeing the townies drive by or arrive at venues with their cars.
Also if a particular sim annoys me, I use MC cheats to take back the nice car my sim gave to them >:)