I think there's one forgotten aspects of nukes that pretty well assures that, perk cost or not, they'd see little use:
To not waporize themselves those planes carrying the Bomb flew near the top of their operational ceiling, and had to dive out and run like HELL to avoid the blast.
How many people are going to want to take the time to climb to 30,000 odd feet and have to time their break JUST right to get the right amount of seperation before that sucker goes off, without throwing off their drop by going too soon?