^ I wasn't necassarily comparing Ayu to MM; just saying that both have an abnormally high number of DVD releases which accounts for them being 2 and 3.
If SMAP, B'z, Utada, Namie even etc., had more releases they would most likely make it higher on the list as well.
AKBs totals are no where near Arashi's, but who's are? AKB most likely will pass Ayu and MM unfortunately; Ayu and MM both deserve it more imo though.