A few years ago I read that the money amounts were so large that they had no meaning to the tribal leaders. Sort of like an award here was for a gazillion dollars.
Look at that farmer who last year who found that wounded Navy Seal after the ambush....he took the Seal back to his village and hid him. The whole village would have died protecting that SEAL...if the Taliban had come.
That edict is what Bin Laden is using to stay one step ahead of us now.