OK, I need to weigh in on the jeep wave... I like the wave; I love the camaraderie. And I've found that the drivers of TJs, YJs, and CJs are much more likely to wave. To the point that I wave at them knowing that it's OK if they don't way back, the next one will.
I know that sometimes people get lost in their own thoughts, or they just don't see you.
Now, there are a ton of JKs on the road, they are freaking everywhere. It's hard to have an exclusive wave when you see 30 of them on your way to work everyday, (and it's only a 5 mile drive!) It's not quite as special then.
But I find that If you go 2-3 times without waving at JKs, you'll see someone wave last minute, miss the return wave and then you feel bad... Until the next one passes 30 seconds later .
Unless it's a tricked out JK, when I wave at JKs, it's mainly to see if I can get them to wave back. And in that sense, I guess I'm a little snooty about it. (are you an enthusiast or not?)
And if I'm topless/doorless you might get a whole arm wave out the window. Depends what's on the radio. Man, I love my jeep.