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Merely posting a picture of a model, with an invitation to buy said model, is hardly a discussion.
But isn't that mostly what the BST forum is about? We don't have many, if any, of the conventional discussions in this forum - bar perhaps this one. Most posts, regardless of private or commercial intent, are simply text ads for kits. No real discussion involved. 
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Maybe vendors could be it's own sub-board meant for them only so if you want to brose more in depth ads from the vendors you can
In theory you already have that in that Vendors is a Discussion group within the BST forum. The problem as I see it is that you guys don't want the latest posts page flooded with BST: Vendor threads. You don't, per se, mind the fact that these guys are posting their wares (yes, we'd all prefer that they buy an ad) but you'd rather it be in a less obtrusive area, and not on the LP pages. 
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I believe it was Gino that stated implamenting a post count limit to use the B/S/T forum
It may have been me. Having seen this sort of thing successfully implemented on other miniatures sites, I'm a big supporter of it. Unfortunately it would require decent analysis and considerable coding rework, so it may not be a viable solution right now.
Rudi