if bayonetta 2 managed to sell 500k in 3 months then it did better than expected. Considering that the first title only managed to sell 1.35 million in 7 months with the combined sales of ps3 and xbox 360 versions(meaning that bayo 1 sold about 700k in each console) and that both consoles had and installbase between 30 million and 40 million each back then, then 500 k is quite good for an installbase of just 7million on wii u's case, not to mention that there are still many month left to reach the 7 months to do a more fair comprision
http://www.gamasutra.com/view/news/119514/Sega_Sammy_Post_Profits_As_Bayonetta_Ships_135_Million.php
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