Ayu ~Anything Goes~ XV (AHS' Ayumi Hamasaki General Discussion Thread)

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Hey guys, I am sure there is probably a thread for this, but I am planning a trip to Japan, and was wondering how long does Ayu usually extend her tours for, in terms of the final dates she adds on, and how difficult is it to buy tickets for these elusive dates outside the TA Lottery system? Also, how much do Ayu tickets cost for a decent/average seat?
Thank you!