I really wonder this. I never clicked a signature ad and am wondering if it works for gambling sites. I need to be enlightened in this topic, because it looks like a waste of money to me.
Its not a waste of money,
Gambling site making some signature campaign and other campaign because they want to get more exposure of their from the community.
yes its helping their business because they have been exposed every time the campaigner post from any thread inside the forums,
it will gather attraction for new players to try the gambling since they are paying for signature campaigners and provably they have
enough funds to pay the players just in case they win inside the site, im not saying everyone but most of the legit campaigns.