Why is the Vita selling in Japan and not here? Well, if you ignore the cultural issues, its because practically any game comes with a shiny limited edition bundle, triggering the OCD collectors gene in most Japanese gamers. I mean we get the black Vita with a download code for whatever game is chucked casually in this month's "bundle."
In Japan, even something pretty niche like IA/VT Colorful comes with a stylish box, covers, cases, tags, stickers, the actual game and other goodies. I'm aware these things cost a little more, but how Sony thinks it can get away flogging the same box year-in, year-out (excluding the slim model change) is rather beyond me.