The buy back system is definitely a keeper, but the downsides are 1. that it only remembers the most recently liquidated five items (so if the item is not one of the most recent 5, it's good game) and 2. the buy back system forgets those items after a few town changes. In either case, those items are gone forever.
Sadly, mistakes do happen, sometimes even to the most diligent of players. I remember once a well known player and friend was cleaning his inventory from runs, and accidentally deleted his gold fbow (which was of the orange rarity, making it look like "trash"), unfortunately, when he noticed it was liquidated, it was too late and was lost forever. Plus, with enchantments, and people who might have multiple pieces from end game sets, either to resell or with different enchantments suited to pvp or pve/gold, or other useful items below the legendary rarity, there is room for error when one is fast liquidating items. As far as being able to protect an unlimited number of items in your inventory, it would make liquidating unwanted items a breeze. I am imagining protected items would be sorted at the top of the list with unprotected items below, and that protected items would have a closed lock symbol on them, while unprotected items would have an open/unlocked lock symbol associated with them.
A bonus feature on top of this would be a quick liquidation button for all unprotected items based on the selected rarity (vanities excluded!) or simply a button to liquidate all unprotected items (again, vanities excluded). Either of these options would be such a quick and easy way to clear unwanted items from inventory and would put one back into their pve runs in seconds flat. Players would of course need to be certain they protected all items they wished to keep before doing that!
The idea of an items protection system was actually born from a desire to do quick liquidations without worrying about accidentally losing items that were intended to be kept.
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