As others have mentioned, the booking sites cite cheaper Sunday night through midweek rates. Even within those days, there is fluxuation. And Fri, Sat nights are invariably highest.
Not true. We use the metric system when we feel like it. Which includes how we measure engine displacement, buy soda, dispense medicine, bill our electricity, and a whole slew of other conventions. But we never forced it down our people's throats and are doing quite fine, thank you. When the other counties of the world can create jobs like America's, they can laugh. Until then, they can enjoy their sclerosis and mind their own business.