Well as nice and dandy as that is, the Vita isn't competing with the 360.
The 3DS managed to sell over 400,000 units (thanks to Pokemon)
Also, look at software sales.
While yes, the Vita beat the 360 in terms of hardware, it only had 191,424 software sales (which is even below the Wii U). The 360 sold over 1.5 million.