Good for you, but the stuff in the supermarket that you buy does...

Good for you, but the stuff in the supermarket that you buy does not have the chance of increasing in value after you buy it, the chance of KZL rising from here is quite a bit greater than it sinking, so to miss the chance of getting more for the sake of saving a few cents does not make any sense as the extra gain you make from the couple of cents is minuscule unless you are buying millions of them, which i doubt you are.