I don't know about that; I've seen them in Chicago-area Starbucks stores for years.
Do tip jars fill up faster when customers use them to "vote"?
One Cornell professor suspects they do. "People find the opportunity to say something about themselves valuable. I would fully expect that would increase tips," he says.
What do you think? Are customers likely to tip if there's a contest involved?
(The tip jars shown are from the Evanston Starbucks at 1726 Sherman Ave.)