When the average yield of stocks in the S&P 500 index is 1.2%, it's easy to see why high-paying dividend stocks like Annaly Capital Management (NYSE: NLY) and AGNC Investment Corp (NASDAQ: AGNC) can look so appealing. Rather, they make their money from collecting interest on residential loans, commercial mortgages, or through mortgage servicing rights (MSRs). Many mREITs originate loans, but they can also invest in mortgage-backed securities (MBS).