It would be nice if Legendary items were also "you can only own 1 ever" items. No sell price/capability. Maybe a special page in inventory for them to sit, with empty slots for the ones you don't have yet. Treasures would be the same, Legendary Treasure cannot be sold. But they have minor effects on you. Like +1 gold per adventure completed, or 10% higher sell prices in shops, or 1 additional item stocked in Randimar's Rarities each week. That, or being able to trade Treasure for same rarity and equal or lesser level gear in any shop. Then getting a Legendary Treasure is BETTER than getting Legendary gear, because now you can go grab the one item you actually do want (when you see it up for sale at least)