Yeah I hear you on that too. I put about 6K in appliances on a 0% one year card, that’s paid off without interest. The TV was half put on a sears card @ 0% that’s paid off. Some of the furniture in the house was on an account with them at 0% and paid off too. The improvements to the house $50K worth in materials was done under the mortgage, which even with that I pay less than most do for rent because we got an awesome deal all said and done.
Those things above all helped my credit score out a lot, but also work against me a bit because its avail. Credit open in my name. and closing them would not be good for my credit since it isn’t long standing.