Why the PS Vita is not selling well?

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The best selling psp and vita game is a hardcore game because Psp and Vita are handheld for hardcore gamers and that's why is promoted like that,most of people buy a console because of games not brand it dosn't metter if Psvita is a playstation if it dosn't have big game nobody will buy it.
Like i said Nintendo console are not like Sony consoles if casuals buy Nintendo consoles it dosn't means they will buy sony console even if sony console have casuals games on it.