Petrol Station

Have you ever goto petrol station where no other cars are in the station?

Well, I been but as soon as I reached my counter, all the other vehicles zoomed in as though as camping for me to go inside or waiting for someone to enter first.

But the most weird part was most of them were waiting at my petrol counter instead of other counter which was really empty. Why?

Can anyone explain why such weird phenomenon? Is there a culture that I didn't even know it exist?