By Tara Lachapelle, Brooke Sutherland & Miles Weiss Blackstone Group LP (BX) and Carl Icahn’s bids for Dell Inc. (DELL) are employing a rarely used deal tactic that has yielded both big payouts and big losses for shareholders. The offers allowing investors to retain stock in the floundering personal-computer maker may help them win over shareholders like Southeastern Asset Management Inc., who want […]