I played a 12 Acc for the first time Yesterday and was amazed by the sound. Is it worth investing in a decent 12 string? How much will you actually use it?
Let me refrase....Do you think its worth buying 12 string if I already have a decent 6 string?
What the two previous replies are trying to say is that can only be a question for yourself.

If you think you'll play it and it's worth it, then go get one.
yeah none of us can tell you whether or not it would be worthwhile to you specifically. for me, it was worthwhile.