Nonsense. We had stable prices before the gambling functions were possible. The gambling functions of the market add nothing of value, and produce no economic output.
it's only stable if you imagined it to be stable - it wasn't. And commodities futures and speculation is only gambling if you choose to call it gambling and compare it to casinos - it's not. Comparing it to a house-odds gambling game like casino is just personal bias on your part, and your lack of understanding of the machinations of commodities trade.