I've seen it done at on-boarding with companies like Freshbooks and Zappos, but I am not sure how often that experience is renewed. (i.e. the rotation aspect being more than one time)

Engineers at Zappos do support for just a few hours a year doing peak season after that onboarding. With a program called "Holiday Helpers" - http://blogs.zappos.com/blogs/zappos-family/2011/12/20/holid...