I don't join TA. I just don't think it really make sense, especially with what's going on with Ayu over the past few years or so...
I'm a member of "Room Ayaka" fanclub (similar to TA), but I mainly subscribe it for her blogs, not concert tickets...but why would I pay $40-50?
I was interested with Sayuri Sugawara's "CHAO! CREW" mobile fanclub (not only exclusive blog but also goodies such as video and smartphone wallpapers!), but I got turned off because a JAPANESE phone is REQUIRED, not just any phone...
(If she didn't change her fanclub management company, m-up rather than e-talentbank, then I could've joined her fanclub with just a credit card...!)