What makes Crafted Items special and different than Rare items?
Most Crafted Items have pre-set mods that are seen on some Set and Unique items, but can never be found on magical or Rare items. Things like Crushing Blow, bonuses based on your total mana, Fire Absorb, and more. In addition there are potential bonuses that can be found on magical/Rare items, just not that type of item. For example, leech on boots or belts, bonuses to skills on gloves or rings, and many more.