One key component called for in nearly every recipe for clean, low-sulfur gasoline is alkylate. Alkylate is high in octane, low in sulfur and has zero aromatics which all help to lower vehicle emissions and tailpipe pollution.
Publicly owned companies, like many U.S. refineries, have a fiduciary responsibility (which is a legal obligation) to act in the best interest of their shareholders, and that extends to how companies spend their earnings. Often, earnings are spent on a combination of the following: direct dividends, stock buy back programs, paying down debt and capital investment projects.