It seems to me that tipping has evolved from an incentive and reward for good service to a form of voluntary workfare where those who have something to spare decide to share with those still struggling in the low end of the service economy.
That being said, I’d much rather society move towards the idea that every job pay at least a living wage
If you go to a bar with "shot girls" who stroll around selling shots, they've often bought the booze from the bar to resell to you.
It's the same reason I just don't see the appeal of strip clubs - I can't stand people being "nice" to me just because they want me to give them money.
I understand it actually incentivizes being an attractive female who touches male diners.