For me, I really want to get a Vita, but here's my problems.
For one, I never see a sale on this damn system, like ever. There's never any bundles that entice anyone to buy one. I know they had the Borderlands bundle, but Borderlands doesn't interest me so I passed on it.
I thought the PS TV would be a definite buy for me at that price, and I've seen lots of sales on it for around $60, which I probably should have jumped on. But while that may be the case, Sony hasn't updated it's compatibility list since October. As someone who doesn't own the system yet, I have no idea if they're updating the system but not the list, or just not bothering at all. The PS TV announcement really made me feel like they'd step up there game, but I haven't seen that so far.
The one thing that the Vita does have going for it is that the games tend to get cheap very quickly. That probably doesn't speak well for the system overall, but I think we all like cheap games.
Basically what it comes down to is I'm cheap and the Vita doesn't help itself get sold lol.