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By Greg Williams

Special to The Washington Post

Recently Starbucks announced it would expand its offerings and start selling alcoholic drinks in the evening in thousands of its stores. The move was touted by chief executive Howard Schultz as a strategy for the company to grow profits by increasing the average sale per customer.

Schultz's shareholders no doubt exchanged a mental fist-bump. But the celebration may be short-lived once they realize that they are in danger of turning away a key coffee-consuming segment: more than 23 million Americans living in recovery from substance-use disorders.

Starbucks spokeswoman Lisa Passe called it "a natural progression for Starbucks as we seek to create a new occasion for customers to gather, relax and connect with each other in the evenings." What Passe did not mention was why a lot of customers already gather, relax and connect at Starbucks — helping to make it the largest coffee chain in the world.

Every day, people in recovery meet up in Starbucks cafes to support one another, to talk to their 12-step sponsors and, most of all, to be welcomed in one of the few lively, popular, alcohol-free gathering places in their community.

Starbucks should pay special attention to them.

One of the most useful concepts in business is the Pareto principle, or what is commonly known as the 80/20 rule. This widely adopted marketing principle — that 20 percent of input causes 80 percent of the result — suggests that 80 percent of all coffee consumed at Starbucks is derived from just 20 percent of their consumer base.

And who might be part of that base? The October 2008 issue of the journal Alcoholism: Clinical and Experimental Research found that 88.5 percent of those studied who were in recovery from alcoholism drank coffee. Thirty-three percent of those coffee drinkers drank more than four cups a day.

That means millions of recovering people drink coffee, and a third of them drink a lot of it.

If you closed your eyes and pictured a 12-step meeting room, you'd probably picture a coffee urn and plastic foam cups stacked next to it. And you'd be right. After a typical meeting, you'd see groups of people leaving together to head for the local Starbucks.

In the short run, Schultz may be adding a new set of customers who bring in a $20-plus sale once a week. But if the evening culture of the cafes turns into a hybrid bar scene, Starbucks will be at serious risk of forcing out a devoted set of high-volume existing customers.