Dome Tour 2001 had
over 300,000 tickets sold in total.
Source:
http://www.avex.co.jp/e_site/tansin/020528e.pdf
edit:
according to this document a total of 330,000 persons attended Dome Tour and Stadium Tour, not 330,000 each but both counted together.
http://www.avex.co.jp/e_site/tansin/0305_mc.pdf