I am an Admin on another (much larger/post volume) vBulletin forum. Typically, I add new forums/sub-forums based on decluttering existing forums where a dedicated forum/sub-forum justifies itself based on existing threads. It is simply housekeeping.
In some instances, I do indeed add dedicated forums/sub-forums based on anticipated traffic/posts. However, the traffic/posts here are a small fraction of the posts on the forum I administer.
Adding too many categories /forums/sub-forums makes it confusing (busy looking) to the new member and discourages posting ("I'm not sure if this is the correct place for this...mods, please feel free to move"). It makes more work for the mods to constantly move posts/threads to their "appropriate" place. As I pointed-out previously, this very thread was posted in the incorrect forum!
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