I dont think everyone would think he was nuts either, but i think thats what he's afraid of. He is good friends with most people on the island and he's probably afraid that will change if he tells anyone. I agree that he should tell them and that they probably would like to know about the numbers, but hurley's too afraid they won't look at him the same anymore, like his friends from home did after he won the lottery.

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\"We\'re not alone on this Island and we all KNOW IT\" - John Locke

Locke: Why do you find it so hard to believe?
Jack: Why do you find it so easy?
Locke: It\'s never been easy.