Yamaha already has the V-Star 250 and the XT250 for beginners. I seriously doubt they consider beginners important enough to risk bringing something else in. Even though it is an existing model, it would cost a fortune to get it certified to sell in the U.S. Used to you could just bring a few over, if they sold well, bring over some more, if not, no big deal. But with DOT and EPA, it don't work that way no more.
I won't spend more on a bike than I think it's worth, but if it's a good deal, I don't seem to have a problem buying bikes I don't need.
2002 Vulcan 750, 2013 Royal Enfield B5
2001 XT225, 2009 Genuine Stella
1980 Puch moped