Moderate nothing. Let the ignore button do it's job.
Make a new sub-forum for each of the major manufacturers and 1 more for any new entrants to the bitcoin mining marketspace. They can be promoted to their own new sub-forum if they make it bigger and appear not to be a scam.
+1.
-1
It's not the forum mods' job to legitimise one manufacturer over another by giving them their own subforum.
It is for the fabricators to legitimise themselves and to band together to agree on standards and promote the industry to everyone in the community in a POSITIVE manner.
Have a Custom Hardware Association subforum that is moderated by members and users. All agree to set standards to post and publish in the subforum.
https://bitcointalk.org/index.php?topic=282030.0 That way the Association and Users are all responsible for the upkeep of the subforum based on a clear set ethical standards for businesses selling mining rigs, chips or diy projects. If you don't want to join (agree to the standards as a fabricator) you can still PAY the FORUM to advertise. That way it is free to advertize but you need to accept the standards before you can POST to the subforum. If you do not comply with the standards you are banned from posting in that subform and your posts are locked and moved elsewhere.