Warpportal needs to provide a safe environment for people to play in.
How are we suppose to know that the zeny/item that I am trading/selling/buying is dupe? Its not like the item comes with an official logo/stamp/mark that are visible to the player and writes "This is an original merchandise", or with serial number so we can check on the website to see if its legitimate.
With that being said, unless the said player is at the receiving end of multiple trades of dupe items, or one big trade with the same char/ip address, its hard to know if they are receiving dupe items/zeny knowingly. They guy could have just decided to play a new class and someone was convenienty doing a class 'Quiting sale' so they bought the entire set.
Another thing is to look at the player's entire history and networth. If he has tens of billions or even hundred billions of items and zeny in networth, you would have to consider if they would risk their account for something cheap. Of course some would,,, but it would only be beneficial in the short/long term if the eventual exploit is more than what they have.
I wouldn't be risking an account worth 100 billion for something worth 2b right? Or 10b for a 300m item? However once it goes above a certain percentage, people might.. and it could be as low as 5-10%, but its more likely to done repeatedly. Hence valuing dupe zeny/item over account networth isn't that reliable but I think its worth to put it into consideration.
Reverse the trade, give them a warning or at least ask them 'How did you get this item and please show proof of your exchange'. If they exchanged it with something equivalent, its more likely that they received a dirty item/zeny without their knowledge and you could reverse the trade. Banning for violating Terms of Service (Terms of Service) without telling them what item/zeny caused it gives them zero chances of defending themselves.
If thats the case, whats the point of us keeping our replay files and screenshots?
And what happen to trade reversal? I remember 8 years ago, a guildie of mine got their account locked, the zeny they got from a stranger got removed and they were told by the GM that it was dirty zeny and to not simply take items from people. (It was 100m zeny and my guildie thought someone was being generous in giving newbie starting up funds). And if they actually bought something with their hard earn zeny, they could ticket to get their items back, instead of just the dirty item/zeny being removed and them losing their item/zeny. No actual bans were given, just account lock while the GM removes the dirty item/zeny.
When that was the case, we as players could just continue playing. Taking extra steps such as keeping screenshots for large purchase incase this ever happens. As for smaller purchase that we didn't want to trouble ourselves with, we were fine knowing that if thats the case, it will be removed it wouldn't be a dent in our virtual pocket. (We could, but its just that we don't want to keep taking screenshots of 10-40m purchases).
We kindly ask WP to make the process more acceptable by the community. If people are guilty of crimes, I believe the majority of them would just accept it and move on. Right now, it seems that some people are not aware of their own crime (that they claim they did not do).