"I would not overestimate retail investors' knowledge of how this business works," says Scott Ulm, co-CEO of Armour Residential (ARR -1.3%). Income fans love mREITs (MORT -1.3%) but can suffer quick losses as rates rise. "We believe mREITs are not appropriate for most individual investors," says Edward Jones' Kate Warne, warning brokers to steer clients away from the sector. Ulm remains hopeful: "As bonds become cheaper, reinvestment becomes more profitable." Beneath a big rally for the averages, the sector is hit again today: American Capital (AGNC -2.6%), (MTGE -1.2%), Annaly (NLY -1.9%), Two Harbors (TWO -0.9%), Hatteras (HTS -1.9%), CYS (CYS -2.8%), Anworth (ANH -0.9%).