More than half of the bill was high priced wines.
NOBODY, unless you are a jerk off who found money on the street and have to show this to the world, pays 20% tip voluntarily on high priced wines.
Check ANY
wine, food, restaurant related board and you'll see what I know for a fact.
Carry on, imbecilles and refuse 20% tip when it's obvious that the voluntary tip will be much less.