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Exactly - that's the point. Same reason Square / Grubhub / most other mobile checkout options usually default to the 2nd lowest tip amount. You need to psychologically be okay with being less generous to move it to 0. Most are too guilt-ridden to move it to 0 so that the server / delivery driver still gets some compensation.

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You can have zero percent tips, and still have the server/delivery driver get some compensation. E.g. a mandatory, fixed 10% tip is no different to a 0% tip where the sever/delivery driver's "tip" is incorporated into the bill.

The nice thing about a fixed/zero tip is that there is no tax on being "nice" and no subsidy for "assholes".

That is an interesting insight on the customer behavior. In our current design we have set the default at 5% (mostly with an intention of providing a visual hint of a tip in the bill and expecting customer to change) and are seeing lot of customers don't change it to anything else most of the times. On the other side we have seen that the customers, who decide to tip in cash, slide this to 0 and pay as high as 25% of the invoice at times.

Please tell me you didn't really expect people to change the default!!???

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