If I had a two-line phone, I'd feel obliged to get a second line. Does that make me obsessive compulsive? (I wouldn't get one, but I'd feel like I should)
I have a few, probably enough for the rest of my life.
I have one in the basement, at my workbench. A different phone, but I have the same shoulder bracket on it that my mother used in 1956. Some of the rubber has smudged, I'd call it, moved like modeling clay. It must have undergone some chemical or strong physical change to do that.
I don't have kids over, but a friend 15 years ago had one on the wall in the kitchen and she told me that her 12-year old kid's friends didn't know what it was.