Starting a brokerage from scratch can sound like a daunting task thanks to the obstacles that come with running a business, let alone one in the ever-evolving real estate industry. Mauricio Umansky with Publisher Brad Inman. So who better to give you some pointers than some of the best in the industry? Sitting down at Inman Connect San Francisco, Redfin CEO Glenn Kelman, Compass founder Robert Reffkin and The Agency founder Mauricio Umansky shared their insight on bringing brokerages to new heights in real estate. Reinvest “We’ve continued to reinvest our own money, reinvest our own profits, and that’s how we’ve grown,” Umansky said. “You have to dare to be bad at something in order to be great at something.” Compass CEO Robert Reffkin, center, in conversatio…