Really tempted in grabbing myself a PS TV, but I'm undecided.

I've already got a PSOne, PS2, PS3, PSP, PS Vita, and will have a PS4 (once Sony actually releases a neat looking model) eventually.

Since I already have most of the Playstation series of games, is it worth my investment?

It's important to note that I do not travel, so remote play might not be important for me (unless I'm missing a cool benefit).

I do enjoy some games like Taiko Drum Master that us US folks never got... so if I decided to go with a PS TV, would grabbing one from Japan let me:

1. Play awesome Japanese games like those

2. Still use my US account

Thanks a bunch for any tips or advice!