I see P5s everywhere, and don't bother waving or beeping or doing anything.
I've seen a few MP3s around here. Only one of them took an interest in my car, but I was late for class and so I couldn't stop to say hello. I never saw it again.
I've seen one other MSP around here. EVER. And it was sitting in a parking lot while I was on my way to work, and I didn't have time to stop. By the time I was out of work .. the MSP was, of course, gone.
I know of one other MSP that's definitely in the area, but he's closer to Harrisburg than Lancaster, and so I never see him.
I used to see a couple when I lived in State College. I saw another Titanium a few times -- and each time I waved to the guy, he looked at me like I was crazy. It kinda pissed me off.