I think I kicked out the Goth family back in 2014. The family who replaced them was rich, but nothing extreme.
Lately I added nobility to my game. There are 4 dukedoms, several baronies and a bunch lords. Especially the dukes have a peerage Trust owning their massive houses/castles. I try to keep it to a level way below royalty, but decorating just one big room can easily include a huge budget. These families are meant to be rich, and as it's old money, I didn't hesitate cheating them the values. But - in the future I don't want to cheat, and one house is already running into financial problems due to bills. I'm finding solutions along the way, such as allowances for the high nobility houses, but they also need to plan their lives early and effectively. It's a cool challenge :)