Since you don't understand why people can't be interested I'll do my best to explain why I'm not interested in the Vita.
Like you said most games are ports. Why would I play on a tiny little screen with poor framerate when I can play on my PC or a regular console and big screen TV?
You say "I can play anywhere" and this is true but I play games when I'm home. If I'm out of the house I have something else to do and there's no need to play games. I'd have loved it when I was a kid and my parents dragged me away from home but as an adult I've found no use for it.
It costs a lot. the cheapest vita with wifi here (Sweden) is over 270 USD. There are just too many other things I'd rather get for that money that I'd have way more use for. Then there's the memory card cost. Another $100 for 32GB... It's insane.
Ultimately: Not enough (if any) good games. There's really nothing I want to play on the vita that I can't play on PC.
Now I do like the hardware of the Vita. I'm a tech nerd and I'd love to have one but I really see no use for it.
Saketume's comments