I am curious as to how we got to the point where a tip is based on the amount of a meal. For instance. a friend and I spent $120.00 at dinner tonight. Friends of ours, a couple, at another table spent $80.00. We received the same good service yet our 20% tips were obviously different. Tips are meant to represent appreciation for service provided yet seems to be more related to dollars spent. I will continue to tip according to current norms but thought it might be interesting to hear from others.