I wouldn't. There is no service that's being provided, but you will still see plenty of tip jars and a line item for tips if you pay by card. As a business you'

I wouldn't. There is no service that's being provided, but you will still see plenty of tip jars and a line item for tips if you pay by card. As a business you'd be foolish to not have that, as you see by other commenters they happily part with their money.