I don't see tipping as universally a terrible practice. Sure, if a driver goes above and beyond in some way, I'll put in a bit extra. But as a routine?

It's not hard for me to see this developing into conversations along the following:

"Um, tips aren't included you know."

"I don't have any change."

"Here let me make you some."

"I really don't."

'Tips are really expected."

"Fine, here's $2."

"That all?"

"Yes"

You: Rate 2 out of 5.