[UFO]

Originally Posted by jamesqf

But to point out the obvious, there is a strictly limited supply of waste vegetable oil. Used to be that restaurants had to pay to have it hauled off. Now they sell it to biodiesel companies, and people get arrested for stealing it: Cooking-Oil Theft: 2 Men Charged In Arlington Waste-Oil Scheme

Mine does not seem to be particularly limited, it's been free and more than enough for almost 10 years. But you are correct in the larger perspective.