I say "hi" or wave, or nod to just about every pilot I see- if they're looking my way- and why not? I like to enjoy myself, and I find that if you greet people in a friendly manner, you'll usually get the same response. If not, well, it sucks to be them, I guess.
I used to work the ramp for Fedex about ten years ago, and I remember how the flight crew would basically ignore me or look through me, and I decided I wouldn't do that. So I try to make it a point to look rampers and CSR people in the eye, and say, "hi".
Seems to me that most people respond very favorably, except for a few . . . and, like the few pilots who act the same way, well, it sucks to be them.
Great thread, Enigma (8N?). Wish you worked at AirTran instead of Spirit- it'd make those MKE-MCO legs go much faster.