For the amount of money someone should charge you, I wouldn't worry about changing such a small thing. I don't think there are too many people out there with the skill set and the time and the ability to get the right price for their services.
This actually has been discussed exhaustively on the 6 board, b/c they hate the "hello" too. I don't think anyone has successfully figured out how to change the message yet. However, people who get into my car the first time think it's cool.
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