BHPetrol is taking its first step with this by offering this free service for now. Eventually we may see the opposite of what is happening now, one petrol pump and twenty EV charging stations. By then, a station like this would have to surely charge for the convenience.
Of course, right now those who will have to wait for their cars to be charged (at least a good 15 to 20 minutes for any semblance of adequate juice). What could happen whilst these folks wait is step inside the station's convenience store and maybe buy coffee and food sold there. FYI, the pies are tasty.