You're right, I apologize. I overreacted because you have taken a strong stance against duping (in two different threads), implying that people who do so are not respectable and that it is "frowned upon". I took offense to that because while you may not like duping, there are certainly legitimate uses for in this game (e.g., obtaining ores).
While it is true that there is a SMALL chance of your save being corrupted if you dupe, I maintain that this is a SMALL chance. It is a known fact that save corruption can occur when you disconnect or quit the game when the game is in the process of saving. When duping items from one player to another, if you do it correctly, the game is not saving when you quit via the PS menu while your inventory is open. I know plenty of people on other boards who dupe regularly and have never heard of one of them having their game save corrupted. Anecdotal evidence, yes. But evidence nonetheless. In fact, I know one person who made a SL 15 "Mule" to allow people to try out new builds and level up quickly for PvP. He has duped to probably 50-100 people (based on requests in his thread) and never corrupted his save file.
I'm not sure what your friends and brother did when they were duping to corrupt their save files. However, if you wait too long after dropping an item, there is a chance the game will "autosave" as it does every 30 seconds or so when in game. If you are careful to not quit when there is a blue symbol flashing in the upper right hand corner of the screen (indicating the game is actively saving), there is a VERY low chance that your save will get corrupted..
BTW, there is a much greater chance of save file corruption by trying to pick up an item while the game is trying to load another screen (i.e., when farming for CDSs using the primeval demon or Crow method). In this case, the game is trying to save that you picked up the item and/or killed the primeval demon, but at the same time it's trying to load another world. If that's what your brother was doing when his save got corrupted I would certainly understand that.
Again, I apologize if my original post was aggresive and rude. You don't like duping - that's fine and I respect your opinion on the matter. However, it is my opinion that you should respect the fact that there are legitimate uses of duping in the game and that some people choose to use duping rather than spending all their gaming time farming for ores.
My last post in this topic - I've hijacked this thread enough. If you would like to discuss the merits/risks of duping further, please PM me - I be happy to discuss with you.