Don't be Afraid

Note: This cheat only works for BUST OUT MODE

Don't be scared to spend a lot of money on the development of the house (aka appliances, couches, toilets, electronics so on and so forth) because once you move out, the money you spent will be refunded.

And even if you run out of money, constant phone calls will give you money for random stuff.

P.S.
Before you upgrade a house, buy a telephone first, to make sure phone calls will keep on coming. THIS TIPS IS FOR THE SIMS BUSTIN OUT