What a joke!
In every episode, the flippers are shown estimating that it will take from 15 to 20 grand to rehab a house. In only one episode, where wiring was obviously wrong do they even look at the electrical system of a house. They try to cheap out on everything they do to fix a house. When a basement floor drain is blocked, they complain about having to call in a plumber that will cost them $100.
Then they claim that for each day a house goes unsold, it is costing them $600. It costs very little to list a home for sale. Real estate agents only get paid when a sale happens. And an unoccupied house uses very little electricity and no water, so utilities costs are very low. The only thing that could be costing them money is if they are renting the furniture they are using to make each house look lived in.
They are basically throwing lipstick on a pig. Then even though they are making a profit, they claim they are losing money.