Well, ANet, you did what I was afraid you would do. Instead of just banning the dupers, you banned people who had received the duped items too - with the result that several innocent people were banned. Yes, those who knowingly received duped armbraces should be banned. But, because banning them would Inevitably lead to banning some innocents also, I cautioned you to let it go. Now you are in the position of having to undo your mistakes
The results? - just look at these boards: lessening trust in ANet, fear of trading in game, fear of playing with others in game, etc.
A post on another board called the duping "the last straw"
Now, I don't believe this individual incident is the last straw or the end of Guildwars.
But, it does show a trend that will eventually lead there if not stopped now. This event happened because ANet was simply too confident. They were not prepared to find this exploit early and were not prepared about how to handle it when it happened.
Here is the problem - with at least 2 years before GW2 arrives, ANet has to add now content and new features to keep the fans active. The more content and more features that are added, the greater the probability of exploits. If every exploit is handled like this one was, the percentage of unhappy players will continue to grow and the possibility of gaining new players through satisfied customers encouraging friends to join will shrink. The end result will be no more Guild Wars.
If you intend to keep Guild War strong and active, I suggest you become proactive instead of reactive.
First, realize you will not catch or foresee every exploit yourself. This duping thing caused as much damage as it did because you were too over confident. There WILL be exploits you can not prevent.
So I suggest that you get the exploiters on your side - just like companies who get hackers to work for them and pay people to find the security holes in their own software.
People use exploits for two reasons - an ingame advantage for themselves or the prestige of being smart enough or creative enough to trick the program.
Use this these motivations to your benefit.
Give an advantage and prestige to those who find exploits and turn them in to you.
For instance - give a minipet to the first player or guild to show you an exploit. Make it one that can only be obtained in this way. It would become an extreme status symbol or a source of a great deal of cash to the player/s who received it.
Or give a headgear that is specially designed and given only to those who showed you an exploit (make it like the heroes' headgear that gives +1 attribute bonus to whatever attribute rune is added to it - that would be a very visible status symbol)
Of course you could give ingame cash, a special title (like defender of the realm?), a unique weapon, a special lining on their guild cape
Or a combination of rewards.
Just be sure to make the rewards outstanding so that people WANTto tell you what exploits they find instead of using them in the game.
Add some rules, of course - they can not have used the exploit for any ingame advantage over and above what is needed to show the exploit is real and repeatable and they can not have told more players than would be reasonable to test the exploit.
By motivating people to tell you about the exploits instead of using them ingame you will be able to find the exploits earlier and shut them down before they harm the game with out causing ill will by banning people.
You have two choices - continue to be reactive - in which case exploits WILL happen and will affect the game. And you will be forced to react in ways that cause people to leave your game.
Or be proactive, deal with exploits in a positive fashion and create loyalty and enjoyment - and profit -for years to come.
May I suggest you try the latter for once?
T

Especially concerning banning innocent people...