I think the most one of my sims has is 3 million. She has all vacation homes, three of the most expensive cars and still has four of the spire soulpeaces that I have not cashed in, I think in all she is probably worth around 4 mil. She owns the whole town, I think, lol. I can't make her house any bigger, but I was thinking of moving her into the old Wolff house though. You can only spend so much, but it was fun playing her, not sure how many weeks I have been playing. She is one of my original sims I started with when I got the game.