I think sensative topics should stay open unless the comments become hostile.
I don't particularly like the idea of self promotion. I think keeping track of # of posts will be very difficult to handle. Obviously if commentors ask about it and OP promotes at that point its fine.
I really don't want companies posting here. If somebody really likes a product and wants to voice that, great, but I don't need more advertising for the sake of advertising in here.
That's my opinion anyway. I'm curious to see others.