Hi Hamid, your entry is grammatically correct, but it sounds a bit strange, although I’m not sure why. In the same context it would be more common to say “Not wanting it would be unusual/strange/inhuman.”

The sentence seems to carry a dramatizing factor that I'd like to point out: If I don't want it, then there's something not normal about me. (Because the thing inquestion is SO desirable) The most colloquial way I can think of representing this idea is through this sentence: "I'd have to be crazy to not want it." But normally people would set the expression outside of themselves in a more general manner like this: "You'd have to be crazy to not want that."