Ooh. Now i get. It seems crude oil in your country is not really a resources that the country actually depends on or that brings revenue to your country. That's why its a business for everybody that can venture into it.Yes, it is legal for them to sell as crude oil is not that much regulated in here and I believe that the wholesellers are taxed for that. The case of petrol pumps are different because they are selling petrol in huge quantity where as crude oil sellers sell crude oil in very low quantity. I have never seen any crude oil seller getting arrested in my country.