Not many WRX's in MI, but I wave to all of them. Plenty of WRX's and STi's in MD, but very rarely do I get a wave back. Sometimes I get the dumb stare, sometimes I get no reaction at all, but every now and then I do get a wave. The other day, I saw an old lady (curly white afro and all) driving a bugeye WRX sedan.
I waved to her.