Imagine being an early beer-maker surrounded by hunter-gatherers. Hunters would have come over all the time to share their catches in exchange for some beer. Early herders as well.
Imagine making beer in the mountains in 2008, and people just 'dropping by' at the end of a trail at the end of a dirt road 8 miles from pavement to visit and bring tobacco, salt, and meat.
It still works the same today. ;)
/johnny