I'm late to the argument here, but here's my 2-euro-cents worth.
If you have a bike as a strictly recreational vehicle, then you choose between looks or performance: the classic cruiser/sportbike split. If you actually use a bike as transport, the chances are that you live somewhere with tight traffic and narrow streets, like a European city. A naked does the business here, which is why they sell so well in the EU and UK. But a big naked is too heavy, too wide (yes, two inches DOES make a difference when lane-splitting), costs more to buy and insure, and cannot display its power advantage in an urban environment. Thus, no sales.
Some big nakeds do sell in reasonable numbers - Bandits and Fazers. They have the sort of aggressive motor characteristics which makes them into streetfighters. But Honda have never made a motor that was anything but smooth, safe and predictable, and that's the wrong character entirely for a streetfighter. Which is andother reason why all the big H's big nakeds, from the 'Big One' through to the CB1000, don't sell. They're too big, and too soft.