User blog comment:CoD addict/Why I can't play Black Ops anymore/@comment-2050801-20110308030300/@comment-1647479-20110308150154

That is one of my biggest complaints as well. Hacker, which costs, requires you to buy the Jammer and C4. The Pro version costs, so we're looking at a perk which costs to buy. If you buy the motion sensor or Claymore, you have to spend a whopping for one pro perk.