I get plenty of wave backs from all Wranglers, and when I get rejected I find it's pretty equal across all Wranglers.
A few days ago a middle aged "soccer mom" in a stock JKU Sahara pulled up extra far at an intersection in the straight lane next to my turn lane so she could catch my eye and wave before I turned. A similar middle aged woman in a TJ this morning obviously had no earthly idea why I was waving to her.
Overall, I'd expent that the folks on this forum aren't the non-wavers. So this is a sort of "preaching to the choir" kind of topic unfortunately.
This is one topic I'm not sure why Jeep doesn't push/advertise. The Jeep community--particularly around Wranglers--is so entrenched. Why not promote that in the advertising materials? At least put an index card in the glove box reminding people to wave.
When I joined the jeep family a few years back the wave was new to me and it didn't take long for me to learn what was up.now its second nature for me to wave to ANY jeep brand and I even wave when im in my work van