Favorite way to make simoleons?

Painting is really lucrative once you get to level 5 or 6 and above. It's bonkers if you give them the creative visionary and marketable traits too. It's easy with a max skill painter to produce 5K simoleon paintings, some of them well over 10K. I think the best one of my sims paintings fetched was 17K. I've read where some simmers have seen more than 20K for a single painting.