EVEN I THOUGHT OF THAT AND ITS A GREAT IDEA... I mean when you are leaving, they take a quick look at the passport anyway. Why not take a second to stamp the EXIT date on it... and there will be no need for all the documents & delays. The problem is solved, simple subtract all stamps of the IN-OUT dates and get the exact number of days outside the country!
LOL... Looks like they are afraid they will run out of
BLUE ink ! LOL