The biggest problem with any Luck weps is that unless the person has the 80 Luck shield (Museum Reward maybe?) you get more luck for the Swords of Prosperity. And the SoP are a Mage Wep -0 skill making it even more useful.
When looting I usually only save 90+ arms, legs, and gloves. If it has other decent mods (MR, LRC, high resists, etc.) I might hold onto any piece over 85ish luck.
You have to remember what competes for the slot that its going to go in. Gorgets are nearly a waste because of the Lucky Necklace or Pendant of the Magi, helms have the Jester Hat of Chuckles, tunics have the Armor of Fortune, etc.
As much as the person may not have these, theyll probably be shooting for them and not want to drop much cash on something they are going to replace...
That was too much info, wasnt it? Sorry