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I especially like the ones that offer you "quick" options of 20%, 25%, 30%. I think they're just banking on people pressing the middle button as quickly as possible without looking at it.

You’re right! People don’t select the lowest number because they don’t want to seem cheap. People don’t select the highest number either because that of course costs more money. Shifting the middle number from 20% to 25% leads to more tip dollars.

Lately I've also been seeing just the dollar amounts as "quick" options, without the percentage. Relying on people not being able to do quick math, I suppose.

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