It doesn't work going down like it does up. For many dealers their commission per gallon is rather small and this is part of why the traditonal service station is a dying breed. My dad made about SIX CENTS A GALLON on gasoline and had to rely heavily on his skills as a mechanic because he simply would not close the bays and sell beer and food. That was his dream since he was a young man and he did it until his wrists and later cancer took that away from him. Still he worked in the parts department of a car dealership until he retired, and then his lung cancer was found.
Working at his stations in the summer and listening to him I learned a lot about his chosen career, but for FIXING the cars. And you can't convince people of these things, they predate political crap as controversy for anyone that doesn't remember Nixon.
And these days you have to get some of your lost margins out of the product before the price collapses, you would go under if you couldn't. In 1983 a vapor locked tank of premium took priming to get it flowing again and $15.000 eant into that hole before it did, then few bought it other than RV owners, a man with a 4-door Thunderbird 427 and occasional people like late Idaho Governor Cecil Andrus, who was my father's dream customer as he idolized him, it was the biggest moment of his career.
My dad loved his work and it was not an easy thing to do, after three different stations in a row he had to declare bankruptcy and return to Idaho to work for another station with a large amount of repair jobs. By that time I had decided that Oregon would be my final home, I love this state.