Shares of Opendoor Technologies (OPEN -9.35%) have caught fire in the last month. Driven by investors posting online about buying the penny stock, it is now up 325%, with most of the gains coming in the past week.Investors are piling into Opendoor, driving up the stock price of this small-cap company with high short interest. Some are calling it the next 100-bagger in the making.However, nothing has fundamentally changed about this real estate platform's business model. Here's my prediction for what comes n ...