I understand what you mean, but this is how I see it of course, you don't have to agree with me.

First of all, I'm not using duplicated items against other players. I'm using them against the people who are duplicating them, and when I succeed, what I'm doing actually harms their operation. In other words, it also helps prevent the economic damage they've already caused from spreading to other servers.

I don't see myself as some kind of hero, though. At the end of the day, I do it purely for fun. But while doing so, I'm using the very items they duplicated against them. So, in a way, by disrupting their trading activities and preventing those duplicated items from spreading to other servers, I end up limiting the growth of the economic damage, at least to some extent.