I’m no industry insider, but tipping would seem to me to be a key indicator for discretionary spending, so a very valuable data point. I have no doubt that a dataset of 1m clients and their tipping patterns would be worth >500k per client (dataset user). A list of consistent, large or skimpy tippers significantly more. (Skimpy so as to know to target them with “deals”, big tippers for the upsell and value added advertising.