Viz announced on March 18th, 2004, that it would begin Second Edition printings for some of their most popular Manga titles. The following link stated one of the main reasons is to lower prices on Mangas for those who may find collecting expensive.
I, for one, think this is a great idea because competitors will want to drive down costs in response. For some time Manga's tag has dropped but this may set it in stone. Furthermore, Viz is doing this to their most popular published series - Ceres Celestial Legend, Fushigi Yuugi, Ranma 1/2, Inu Yasha, etc. Thankfully, they are not some bargain-bin run-of-the-mill Manga and the real deal!
Very exciting, indeed!