Make the bid, take the tricks
Make your contract and your team scores the number of tricks it actually took — not the number it bid, so overtricks are worth having. Take all 13 without having bid Kabbout and the hand is worth 16.
Miss the contract and your team loses the full number of tricks it bid — miss a bid of 4 (10 tricks) and you lose 10 — while the defending team scores the tricks they took, or 16 if they took all thirteen. Falling one short of a big bid is expensive twice over.

