I think I was wrong.
I think it's an American thing. That would be why it always happens on TV.
At work today, I had to make phone calls. It felt like a million phone calls, but it was actually only about 50. In any case, I talked to a lot of people. And only about a half-dozen of them said 'goodbye' at the end of the conversation! Seriously, people? It's a standardized social format, meant to indicate the conclusion of a telephone conversation! Saying 'goodbye' lets the person on the other end of the phone know that you are finished, that you have no other questions or comments, and that you're about to hang up the phone!
'Goodbye' shouldn't be reserved for friends and family, it should be for any phone call, whether it's your doctor's office, a telemarketer, or your grandma. Saying 'goodbye' is just good manners.
In other news, my puppy's ear seems to have recovered - it's back to being perky, and she's not scratching at it any more. Yay! No vet required, although I will continue to keep an eye on her.