I hate that so very much. There's no problem starting with a salutation, but just hit alt-enter or else I have to wait 5 minutes for you to finish typing out the entirety of "Moby Dick" in chat.
Because the people that do that the most need tend to need something urgently that will make me stop what I'm doing and handle their problem anyway. I'd rather just be interrupted all at once than in dribs and drabs.