Bhai government is not an pvt ltd company. It has a huge responsibility towards the people specially marginallised and weaker section areas.
And according to your logic if revenue is the priority then what will be the difference between Britishers and present goverments. They also are doing the same exploiting the resource rich areas.
Also according to your logic the exploitation of resource full India was justified then by Britishers and enrouting the coal iron to britain.