One of many reasons why I -
A) avoid Luna unless it's absolutely neccesary to go there and
B) empty my pack before going there, keeping a few emergency runes and gate scrolls in my bank box to get me back home again.
Anyone who is going to Luna for reasons other than PvP really has very little reason to have anything in their backpack at all. Yes, I know - 'why should I have to do that, etc' - I do it because I want control over what I might lose, plain and simple. If you're there to trade, trade from your bank box.
If you're there to PvP, well, you're not much of a PvPer in my personal opinion. Real PvPers don't need guards to back them up. Real PvPers do it at least 50 screens from a guard zone. Real PvPers do it with whipped cream! Um, maybe not that last one.
*waits for all the 'you don't PvP, so shut up' excuses*
But, exploiters are lower than mongbat dung on the food chain. We still have player justice around here somewhere, right?