Legions of consumers happily pay the (minimum) $55 annual fee for the privilege of shopping at Costco. The discount warehouse operator closed out fiscal 2015 with 686 outlets, an increase of 23 over the prior year, according to the company's annual report. During that same period, shopping frequency grew by 4 percent, memberships jumped more than 6 percent, and more than nine out of 10 members in North America renewed their status. Aside from the savings that come with low prices and bulk buying, what keeps shoppers coming back for more? Here's what members say in online reviews and a Cheapism.com Facebook poll.
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