I hate to say this, but do you think Harley has anything to do with it? I'm not sure what there oversea sales are (can't imagine it being that huge of a market), but I wonder that since they do hold a fairly large chunk of the market in the States if that has an impact. Still, you look at the cruiser line-ups of all metric mfgs and they have a ton. But when it comes to sports/sport standards the pickin's is kinda slim.
I've been cursing Yamaha under my breath for the past few years for having such a small line-up of bikes compared to the other Japanese mfgs. I'm not saying the R1 and FZ1 aren't works of art, but they need more variety. Don't care much for the YZF600R, and the R's are way too much $$$.