iBuying is still an unproven business, but Opendoor is the best bet in the industry.iBuying has been one of the most disruptive ideas to enter the real estate industry in decades. iBuying, which stands for instant buying, is home-flipping taken to its logical end, done at a large scale by corporations, rather than just a small contractor.The practice once held a lot of promise as technology has made it easier to buy and sell a home, see comparable sale prices and other useful information, and collect and an ...