It’s human nature to want the cheapest price but be careful what you wish for, the cheapest product from the cheapest vendor comes with a guarantee only of mediocrity in one or many ways.
I’ve no expertise in volatile values of commodities, but it stands to reason they sell at today’s value regardless of the price paid, should the price drop, will everyone rush to help out the poor guy with a whole stock of overpriced fuel as a reward for not putting up the price to reflect the restocking cost when they should have.
Silver has existed for thousands of years but doubled in price in one, who today would sell at any price achieved from any date in history more than six months ago, I’d guess nobody who wants to continue is business.