I have; I worked in an ice cream stand at a dairy farm. And you're correct, because of the tips we made much more than we would have even if we had had a higher wage.

But to the point of the person you replied to, on the busy days, there would be two of us working. We were free to split labor however we liked. We made far more tips when it was my attractive, female, coworker taking orders and interacting with the customers, and me scooping, than the other way around. People absolutely do tip differently based on their biases regarding the worker they are interacting with.