The subject was regularly discussed and cogitated on the MX-5 Owners Club forum (my previous weekend drive).
The problem is that you feel such a 'prize prune' when you wave but don't get a wave back so then tend not to wave next time. It may be that folks don't see you wave at them, or they are too shy to wave back...or too 'up themselves'.
It's a shame because when they do wave back at you it always feels sooooo good.
Keep waving. You know it's the right thing to do!! :tu: :Beer: :rockon: