I regard tipping as a form of gratitude for good service. Something that is given without expecting to receive anything in return. Paying cash up-front in order to get special benefits is more like a bribe.
Let's say the hotel has one last suite left available and two people are about to check in. One holds top tier status with the chain and the other has no status but is a great "tipper". To whom will the receptionist be more motivated to give the last suite? But why stop there, next time when a police officer stops to give you speeding ticket or alcohol test just slip a note into their pocket to make it go away. If they act surprised just tell them it's a common practice in some countries. Also, next time you want to win that important contract make sure to slip an envelope under the door of the local councilman, that's the way business is done in many countries, so it must be ok then.