See those big AAA games that people wanted on the Vita? This justifies them.
See that causal market that occasionally plays games and mostly want to stream movies and music? This is for them
See that PS4 gamer that wants to play in different rooms in the house? This is for them
See that gamer that wants a cheap, low powered device to play indie games on the couch? This for them
See that kid that broke his vita and has a bunch of memory cards and games that would otherwise go to waste? This for them.
See that Vita gamer who was playing a game on their commute, but never sees the point of continuing while at home because they have a huge TV for gaming? This is for them.
See that nostalgic gamer that only wants to play some old PS1 games but doesnt want to buy a huge bloated console for them, just something small and simple? This is for them.
So many applications and scenarios.