Because the promoter didn't sell enough tickets. That's why the South American tour was cancelled. The promoter (an ex friend) thought that Moi dix Mois was famous in this continent, he contacted Yuki Itoh, they arranged a reunion in Tokyo, and the promotion of the tour started. Here in Chile they booked a really big theater for almost 5 thousand peoples, but they sold, at least, 500 tickets xD
Moi dix Mois is not a popular band, is a niche band. So I really appreciate Wunderwelt is arranging only Mana events around the globe, and not with the whole band. Mana is popular, he and what he created with Moitié and the Lolita movement. but not his band MdM, cause not everyone likes that music or genre.
I have talked about this many times and I am sorry if it is not to everyone's liking, but is the truth (This remember me some dudes that think Dir en Grey is a popular band in Japan because is popular with the J-Rockers overseas, but is not a popular band in they natal country like, maybe, Glay, Laruku or Luna Sea).