Lots of money: looking for ideas

when my sims get filthy rich I like to have them hire entertainers and service sims at their home

for those times you just want to take a bath and listen to pipe organ but ah everyone in the house is so busy working on their bestselling novels and whatnot little projects they have going on ☺️

I buy the vault from Get Famous and deposit the household funds in there.  Psychologically making their life savings "unavailable" restores the challenge of paying bills, which can be challenging indeed in a huge, fully swanked-out home.

ReflectedLite 

You could eat out a lot or cook expensive meals. You can keep the lights on in your house all the time. You could also decorate a vacation home, so it's more expensive to stay there. The ultimate glamping experience. You could buy expensive gifts for people. If you have the Potion Master trait you can burn through quite a bit of money making moodlet potions. If you have level three fame and a great reputation you can lose tons of money donating computers and artwork to charity. 

Get the travel bug and go on vacations,  go to events, have fun at night clubs, pools, etc.  if you have Get to work start a new business.  if you have high school years, go to bubble tea and make some of your own outfits.  If you have Jungle adventure become an archeologist.  If you haven’t collected everything, work on collections.

Vacations can be quite expensive, depending on how luxurious the rental is and how long you stay. I have a haunted castle and a yacht for rent and you can have a butler there as well for maximum comfort. 

Businesses can also be very expensive, you spend money to build the lot and then you need to spend some more to run the business, train the staff, etc. In my experience, they are money pits.

And then there is everyday spendthrift style spending, like hire all help staff possible, eat out at the fancy restaurant every night with a group of friends, leave electronics out in the yard and replace them after they have been hit by lightning, literally burn money at the fireplace, donate and gift money, gift expensive stuff to your friends, recycle expensive stuff in the recycling machine. 

Anyway, if you have lots of simoleons to spend,  maybe not worry so much on what to spend it on, because it will be spent one way or another, but rather use it to advance hobbies, relationships, aspirations, etc., things that you don't normally have much time for because of the need to work to earn money.  

you could also transform to werewolf and start eating princess cordelia furniture as a snack

Hello. When my Sims have too much money, I replace furniture with brand new ones (pricey), and I don't upgrade them. Never repair the broken furniture (TV, shower, toilet, etc...), make a call, it will cost more than you think ! You can use the Lot Challenge "gremlins" too ! No garden, no vegetables delivery, cooking for one person (no family meal)... The Sims can also give money as a gift to friends and family, or donate on computer if they have the "generous" trait.

Tashigi_nee-samaI completely forgot about gifting people money. You can go around town buying people's affections. Or you could be George Bailey and give townies money so they can move into better homes. 

My matriarch got to the point where her simoleon level no longer goes up. She gives away a lot to charity, burns money, sends heirs off on their own with decent inheritances, spends a lot of money when she goes out buying drinks and meals for other Sims, orders lots of groceries and books, replaces broken appliances instead of fixing them, and buys expensive items just to pack them away in the attic. I'll have to do the expensive decorations thing in a vacation home at some point too.

I have my Sims replace the broken appliances, etc. instead of repairing them. I know, mundane, but it does chisel the money pile down a bit, if that's what you're looking for.