Every so often we do a spring clean on the forums. We categorise topics if they exceed over 100 topics being discussed in a "general" forum.
e.g.
"General printing Discussion Forum".
So If there have been over 100 different discussions started in the "General Printing Forum" based on "Mutoh Printers", then we would create a new forum dedicated to those machines. All I can say that the last time we did a general organising of forums, there would not have been enough discussions on those machines to warrant a dedicated forum.
Hope this helps explain some.