Don't speak too quickly..... It was only 3-4 years ago during the floods in Pakistan that the American GOV had Hillary Clinton give them $7 billion for disaster relief..... hmmmm and then Obomba's drone campaign ramped up big time killing pakistanis on the border with Afghanistan.
Looked like a pay off to me at the time... I even created a thread about it here.
I wouldn't be surprised if the Pakistani GOV and the American intelligence GOV worked together in convincing the whole world that 'nobody knew OBL was hiding out in Abbottabad'. It helped Obama look good as a war hawk and it also kept the Pakistani GOV from it's citizens turning on them to deny allegations from american politicians that they knew his where abouts.
Just a hunch.... seemed perfect.