There are several reasons why i went for a 250.
Years back it was very difficult to get your hands on a decent bike here, even so i had a large bike which was great as the traffic was much less than it is now.
One problem is the heat which is a killer for large bikes especially air cooled ones and the awareness around you that you are MUCH faster on a higher CC bike is simple not there.
Since Kawasaki and others started to import the 250er only two years ago it was an great option to get a commuter for an OK price.
We have luxury tax here which makes the larger 600+cc bike as much as 3 times as expensive like everywhere else...
I hate my Kawasaki dealer they put a orange Z800 into the window and i have to pass that everyday!!!! But at 25K it wont be mine anytime soon though
BUT there is something which got my attention