As the seller said, it's no different than a lot of content on Google images, youtube, and lyrics site.
If the copyright holder wants to enforce their work, then let them. The DMCA is already in place.
It's not the job of DNF to enforce every single post on the forum.
It's VERY different. Google Images provides links to the originating site with ZERO ads on the search page. Youtube has lost cases and paid cash settlements in many cases, and has formal agreements for copywritten content that it does provide.
The person selling the stolen images in this thread is intentionally attempting to conceal the theft by removing trademarks and hiding behind whois privacy. That makes this a criminal case and also means the copyright holders can sue for a higher level of damages.
And yes, DNForum *IS* liable in this case, since their policy states that they moderate these forums and are actively participating in a criminal act. If any of the images here were mine, I would be filing both a criminal and civil case against Adam Dicker, and the person who is selling the stolen images.
You have to be utterly stupid and uninformed to think that copyright laws do not exist and are not enforced... not to mention completely unethical.
DNForum has a choice to make -- let idiots like this try to dump stolen goods on a new domainer who many not understand the issues, or do the ethical (and legal) thing and ban this person from DNForum.