PDT 2/2 : Why has tipping increased?

[El Diablo]

Adam,

Bartenders definitely don't get the shaft.

1) $1/drink is often greater than 20% for cheaper drinks like beer.

2) People at high-end bars often tip more than $1 per drink for top-shelf cocktails.

3) People often tip 15-20% when paying by credit card, which often ends up being more than $1/drink.