User blog comment:VvExcal/The Anti-Duper Idea/@comment-25955276-20150614000406

I don't think that would be a very good idea.

First of all, what would be considered "rare"? Ruk would have to go over the updates over and over again to remove this prevention off of items.

Second, why would you lose the item? Plenty of people have accidently dropped items and have had to pick it back up. It's not as if anyone who drops an item is a duper.

Third, what would this do? This would probably end up destroying SAO:B's economy, making its economy rather terrible for most games.