[thackney]

They've made billions with out new ones so, why would they put more refined product on the market and cut into their PROFIT?

Because they would not build so much to cut into their own profits. However, they would make more money by displacing foreign owned refining that imports gasoline to the US.

[tobyhill]

The only problem with displacing foreign "owned" is that US companies actually own majority stakes in the simply renamed foreign companies where they get cheap labor and undercut priced crude.