Favorite way to make simoleons?

I found recently that making a sim a writer was a bit over powered. I sent my sims on holiday, she made 30K in a week while doing nothing. I swear this family wasn't meant to be this rich. My other sim is currently studying to become a doctor, but while she' study they can still afford the upkeep on a 200K house and a butler. It's pretty nice to not worry about money there.