The A-10 was offered to Pakistan in the 80s and rejected then because we had plenty of money but no insurgency to fight. Now we have an insurgency to fight but we don't have the money for a fuel guzzler like the A-10, not to mention the DU rounds don't exactly come cheap. Another important point to consider is that there is no airfield in FATA that can host an A-10, so if you want a reload or damage control, Peshawar is your best shot. Cobras on the other hand, make good use of fuel, use TOW or Baktar Shikan Missiles and 30mm rounds (plenty of both) and the best part, they can land on a road, field, or even a good given ledge and given a complete reload in 15 minutes by 4 technicians carrying missiles and rounds in a 4x4!