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.