It's not a bad idea in some respects and I'm sure you guys have no bad intentions. However, one thing we have to consider is that a section like that could easily become abused with some folks exploiting it for free advertising. Our customers that pay for advertising here would justifiably be pretty bent if one of their competitors had free advertising in an area of our forums. We have millions of page views each month which attracts waves of spammers as it is.
A sub-forum of this nature would cause more work for mods to try and really comb over posts to determine if they were legitimate "average Joes" posting or if they were coming from the companies themselves (directly or indirectly). Make sense? I don't mean to dump on the idea but just trying to paint the bigger picture.