The Sinai was conquered in a war. For good or bad that is usually how throughout history land changes hands.
And of course you missed the point of the post. The other poster was accusing Israel of holding on to conquered land due to greed. I merely pointed out that if that were true, they would have kept the Sinai, which was the most (monetarily) valuable piece of land they had.
Sort of reminds me of the Y2K days when JT was a raving lunatic.