User blog comment:Furkan Zomer/Possible Solution - Cursed BBI Weapons and Armor lv.3/@comment-8.23.59.254-20130712154025/@comment-8.23.59.254-20130713095046

Either that or its just to get a garaunteed piece every 5 items (or w/e the pattern is) instead of a 10 percent chance on your first item and a ~20ish percent chance on your further items (I'm not getting complicated with math here).... I dunno.