(Bloomberg) -- When third-generation dairy farmers Dane and Travis Boersma were looking for something to do outside the family business, they decided to try coffee. Not only could they make a little money, they’d be able to hang out with friends and listen to music. They pooled their savings to buy a coffee cart and an espresso machine and began selling in downtown Grants Pass, Oregon, in the early 1990s. Pretty soon they had five carts.