I mean seriously.... that's insane amount of money. My singer sim is making 60k a week just doing two steady gigs at the local big show venues. (not to mention the random gift I get every week for being a 5 star celebrity that could worth up to 15k or )
I can cancel steady and do shows every other day for even more if I want to.
The only way to make more money that i know of is transfiguration (or whatever it is called) of tiberium with a martial art sim (or a very capable dog), but that's a lot of micro management involve plus you need the skills, the training, and MATH. (BTW, supernatural made this even more broken with gem cut machine, which means each uncut tiberium your pet find can be cut into 3-4 gem dust which all grow into full grown spire cut in a day or two).
This kinda makes painting/writing etc pointless since those require so much more grinding and don't even make nearly as much.