How do you accidentally drop a valuable item, nonetheless, if they were restocked shops, the market will flood with these valuables. So, it's not a bad thing. Unless youre trying to make mesos.
Let's say you meant to double click the item to equip it then accidentally drop it. Let's say you're selling off pensalir gear and accidentally NPC your item and not notice. Let's say you forget to tick the "safeguard" box in the enhancement window and your item turns into a trace. There are so many possibilites.
We should not be punished so harshly for human error. Does it make sense that just by 1 small mistake, you have to restart your entire character even if you've been playing on it for 2 years? Why is the game so unforgiving? How does this encourage gameplay and make us want to spend money?