Tipping at Christmas

This morning I took a Christmas card and a $20 bill into Panera's, addressed to "The morning staff," and included a little note of thanks. It seems like a big chunk when you give it at once, but not amortized. I'm there about 4 days a week, 42 weeks of the year, so that's what, about a 12 cent tip per visit on a $1.69 cup of coffee with several refills, a seat by the fireplace, regulars and friends to chat with and 3 papers to read? Two of the staff members came over to my table later to personally thank me. That was nice--and it gave me a chance to share about "the olden days."