In a study by CustomersDNA, 61% of respondents who said they drink coffee at home said they don't buy coffee from Starbucks, Dunkin' Donuts and other quickservice restaurants. Yet the same group said they purchase Starbucks and Dunkin' coffee at retail stores 15% of the time, a "testimony to the powerful brand images that these QSRs have created,” said Dave Jenkins, a partner in the research and consulting firm.