If that's the kind of human one has to be to get wealthy, I'd rather be poor.
I'm glad I am not your employee. I can just see you telling the workers the next day: "Sorry, but I can't afford to refill the tanks because we didn't get enough cash from selling that last tankful to refill it at the new, higher prices!"
And tell me...if the prices go DOWN, would you conversely sell the fuel at the price you bought it?