I'm not too bothered about their loss, given that gas pumps now have advertising screens installed. Let the ad revenue make up for it.
That said, GP's assertion that the station can make up for stolen gas with ads is nonsensical and dishonest.
Or what some of us refer to as 'humour'. It's worth getting into, a lot of people say good things.
I'm here to help.
However, you'll get arrested for stealing gas -- so as a practical matter, when confronted with the situation, tolerating the ads is the recommended option!