I'm quite surprised that this ploy was allowed at all, I think that this is a topic really similar to counter scamming (which I'm pretty sure is not allowed either....) I just got internet back, and am just reading about this now but at first glance I find it ridiculous.
Granted, you had good intentions, I just don't think that it is at all right for staff to be lying and doing actions like this. If a normal user were to do something like this, they would get banned, obviously. That is why I don't think that it is right for Staff to do things like this, it is setting a very bad example for members, let alone it is a bad act to begin with. The methods for catching scammers that are already in place work fine, this was unnecessary and I feel like it was probably done more out of entertainment and curiosity purposes, rather then the thought that it would effectively catch people.
I don't really sympathize for the people banned, they are obviously idiots, and this ploy just gave you guys a reason to ban them. Although I just don't agree with the methods that were used to go about doing so. It is all over now, and there is nothing more that really matters but I don't see how it should even be a debate for you guys about using methods like this. I would really really hope that this type of thing wouldn't be attempted again, just let the current system do what it has always done...
This is just my thought at a quick glance, I am just seeing this all now so my judgement is just based off of the first posts in this thread and the n4n0s msn is hacked thread. Ill try to post a little bit more later..