1) Yes, I would consider it.
2) I don't think it's a waste if I get to enjoy one of my favorite franchises ever months early.
3) There will probably be other games in the future that never come outside of Japan that I would want so I see it as a future investment. One example would be Pheonix Wright 5 or Professor Layton vs Phoenix Wright.
1) the way rich people spend their money is fascinating.
2) if the game is coming out internationally a few months after Japan's release (like you had said) then you seriously can't even wait that long? I'm like... really suprised, everybody has waited over 2 years for the game.. a few months wouldn't hurt. And you don't have to buy a japanese 3ds + the game to enjoy the franchise. Just watch the gameplay videos/ trailers / commercials maybe? there would probably be thousands of videos uploaded.. enough to last you till the game releases internationally.
3) do you even know how to read japanese? How are you supposed to play a game like professor layton (which is like more than 80% text) ? i mean with animal crossing it would seem more plausible but professor layton seriously? And they're releasing the recent professor layton 3ds game internationally so I don't see why they wouldn't do the same for the ace attorney one. There's a high demand for that franchise outside of Japan. So you can't just say it would never happen.
p.s. If you know how to read japanese then i take all this back.. but it would still be a stupid idea regardless.