Prophet of the Pump

So I was pumping gas yesterday on the way home from work and saw this wonderful and informative sign posted on the pump. Curious as to its' inner meaning I had to take a picture so as to ponder and meditate on it it.
What exactly
ARE they going for here? Are they saying that customers should be more polite and say please and thank you? OK, not bad advice really. Are they begging for more patrons as in " More Customers, PLEASE!! ahem..thank you"?
I think it is so simple that it's infinitely complex and beyond me feeble grasp......