Is tipping an expression of gratitude or a mandatory payment?

Is tip part of the chargeable fee? Is it mandatory or is it a social norm? If the institution expects the customer to tip, why not add that on the original bill?

Isn't the client paying for the product and service already? I love a gesture of appreciation for a good service , but if it's expected how can it be a gesture of gratitude.?

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Lukeman · M

You only should pay out of gratitude for good service so as to insure proper service.

Renkon · 41-45, M

@Lukeman That's what I was thinking too.

SomeMichGuy · M

@Lukeman You should pay a tip for great service, not for average service.