If i setmsg 1 to: "Thank you, dear customer.", i could easiely add something like: "nice deal." or "Enjoy the wine and the cigars." Or if i make offers in space. It would save me alot of typing time here and there. Sometimes i have to deal with 4 or 5 customers in the same time, and some are using private comms. Each letter you dont have to type is nice in such cases.
I dont thought about the use of names, but also useful for that.