Why is "Lone Star Beer" only sold in Texas?

Most companies want to earn as much money as possible, to make larger profits and to attract more investors. Yet, this beer brewer prefers to supply only Texans with their lager, and I’m wondering what the reason could be.

Is it because they want to make it harder to get, or make it “rare,” to increase its value?

As i recall, there was a time when Coors was only sold in Colorado, but their sales and profits skyrocketed, once they went nationwide.