Because oil companies totally need more money...
Oil companies make money due to ingenuity, and a service that they provide. When they make money, they create jobs. When jobs are created, other people make money. What is up with this bull crap "its not fair because they make more monies!!! STOP REPRESSING BY FORCING US TO BUY YOUR PRODUCT/SERVICE!!!".
Please explain to me how we would get oil if oil companies didn't provide it, why people would invent things if they weren't given an incentive to (A.K.A becoming rich, improving their situation, etc.), why people would risk creating businesses if they weren't given money for doing so, why its unfair for a rich person to pay the same rate of taxes as a poorer person, even though the rich person RISKED his money creating that business. When a business man invests, he is risking his future. He rightfully deserves every penny he gets. If you don't like him making money, don't support his business or buy his product? Herp derp?