Some people avoid taking a holiday or business trip to India, because they don't like the constant harassment from street traders, the expectation to barter and bargain for everything, the ever-present concern that they're either overpaying or being ripped off.

Some of these people also avoid travelling to the USA (and Canada) for similar reasons. Am I supposed to tip for this? Is this a $1 tip, or $5, or 15%? But the card terminal is giving a choice of only 20% or 25%... and is it better to leave cash anyway?

(I'm sure you could explain every situation, just like an Indian can explain all the situations in India.)