Annaly Capital isn't the kind of stock that most investors should own, but there is a small group for which it might be appealing. Annaly Capital Management (NLY 1.36%) is a real estate investment trust (REIT) that buys mortgage securities. This is a somewhat high-risk niche in the broader REIT sector, but one that often attracts investor attention because of the lofty yields that mortgage REITs usually offer. That's the big story with Annaly, too, since it sports a huge 13%-plus dividend yield today. But d ...