Addiction may be a secondary effect, but I'd say the appreciation of good coffee flavor is the primary motivation. You can be addicted to caffeine and not care about good quality coffee. In fact, I'd say most coffee drinkers fall into the latter category.
To me it's simply the equivalent of a foodie's interest in preparing good food.
George Carlin once described being addicted to drugs as the enjoyment of the ritual surrounding the usage not the actual effect. He was addicted to feeling you get while preparing to get high possibly just as much as to the effects.
