How to Increase Tips

In Konka cafe in Tbilisi, Georgia, the staff wear these t-shirts:

IMG 0814

Even though the cafe already added 10% service charge to the bill, I still felt compelled to tip. I wonder if the cafe has performed tests with and without these t-shirts? I suspect tips are significantly higher with the t-shirts.

 The software mogul in me wants to perform A/B testing to determine the difference.

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