With the upgrades in Eco Lifestyle coming up, people may be spending a lot of money redecorating their houses to be eco friendly. They'll then have to upgrade all their new items.
If you're Good, you can donate a LOT of money to charity. It has the plus of improving your reputation.
You can also go on vacations designed to Collect items. My millionaire Sims have just completed Strangerville (there's very little time to focus on spare money-making activities) so now it's time to use up Vacation Days and deal with the insect collection in Granite Falls.
