Good question. But by the same token how do we know who people here are? I guess what I am saying is, the info is out there and has been for a long time. I personally don't think this seller, or wicksy22 (I think that's her ID?) or any of the other sellers who provide guides to buying authentic designer items are doing a disservice by consolidating the info because I'm pretty sure the counterfeiters already have much more info than any one individual could ever amass unless they literally camped out at the store and bought a new bag every day! LOL
I see your point and I can see why you might find it concerning, but really to me personally the potential good (saving people from throwing away thousands on fake bags/giving the counterfeiters a continued market) is outweighing the potential bad.
Naturally, though, everyone has their own opinions. I'm just sharing mine because I find it an interesting subject.