You can probably see why real estate agents and contractors get into the house flipping business. Real estate agents have a strong knowledge of house prices and can lower their costs by buying and selling the house themselves. Contractors have a similar knowledge of renovation costs and can save money by doing their own improvements. Real estate agents who understand the rental market can make good house flippers. That’s because if they are having trouble selling the house quickly at the price they want, they can turn the house into a rental property to help pay the monthly costs of owning the house and protect themselves from taking a loss.