Sentient_Nebula on 15 February 2015
Numerous reasons, really. But much of it tracks back to one thing: An overall lack of support.
I think Sony thought the Vita would sell itself. The Vita had almost no marketing, and while it had a fairly good launch lineup, support rapidly waned.
Also, (maybe I'm biased) It's hard to call the Vita a "failure" per se. Sure, it's sales are very low in the West compared to the 3DS. But in Japan, it's doing reasonably well. And I think SCE has probably made a profit on it, even if it's less than they would've liked.
"Never argue with stupid people. They will drag you down to their level and then beat you with experience."
-Samuel Clemens
