Here are my thoughts.
Site traffic is down, not up, so in theory we'd be talking about combining forums, not creating more.
We have a ton of forums already, I'd rather be consolidating to make navigation easier. Some people cross-post already which fills up the 'new posts' search with duplicates.
We already have thread prefixes which are required to be used in the for sale section, one of which is Ski (maybe should be changed to Complete Ski?), which is searchable if you do an advanced search.
On the separate sections for dealers, again it would add another forum, plus if we did add that functionality, what determines who can post in there? Do they have to pay? Why pay when they can post for free already, so do we prevent companies from posting if they don't "pay up"? Do they get a forum each? This topic has been talked about quite a bit between myself and a few others with no general consensus on how to handle it.
Those are my thoughts, it's open to whatever the general consensus is.