Haha, i guess I subscribed to this thread because I received a notification email.
Anyway, no, I did not end up going. The tickets were very easy to find. Especially in Takeshita Dori where they had quite a few. Unfortunately I think the cheapest ticket was the equivalent of $600 US for a bad seat... I even checked on the day of the concert, and the price only went down a little bit. So expect to spend a lot of cash if you're really desperate.
For me, as I was searching in Takeshita Dori for tickets, a random agent offered to invite my friends and I as VIP guests to the X Japan New Year's eve gig for free. I couldn't resist such an offer!
Good luck! getting tickets to concerts for your fave specific JE bands will probably be easier (unless it's Arashi)