If you're promoting a casino-based campaign you need to post at least 5 to 10 posts in the gambling section Currently there are 1136622 Posts and 5903 Topics in the gambling discussion alone the gambling announcement not included making it the most active board here in Bitcointalk.
If There are No Casino Signature campaigns Anymore Will The Gambling Board Still Be The Same will we have the same stats as we are seeing right now
I think it's clear from the figures you posted how much the signature campaigns prop up this part of the forum. It works both ways though, because Bitcointalk is able to generate a lot of content it will continue to hold a lot of weight and show up more often in search engines which helps to grow the user base further. I'm not really sure whether people are converting based on following links in signatures, but considering how long these campaigns have been running they must have a positive effect. I don't see any harm in it, as long as the content is kept reasonably good and doesn't end up with a lot of single words or one liner contributions.
Single words are shit but one liners could be considerable depending on how someone would able to respond a particular subject or topic as ling it would be relevant and not off topic then it wont be considered to be a
shit post.