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.
Obviously if you're not a type of a guy who likes to gamble there's no reason for you to check out the signature link. It's not a waste of money to run a signature campaign, once you create a campaign and target a certain area for your product to be seen by the members. Guaranteed they will click the bait.