All of these are brilliant ideas! But when it comes to what would be gathered, besides rare items, finding crafting items, such as Steel Rivets, or Natron would make this very useful. Now, these items would not have a high scavenging rate, but it would be at least something moderately guaranteed. But at much higher levels, besides gathering unique items, having a chance to get a Darksteel ingot or Vanya silk would make this worth it alone (Or armor Augmentation tools)! Mostly a Gathering Log would be followed, like any job. But what would we use for tracking rare items...