In my opinion, off topic is kind of useless section so its just understandable if signature campaigns don't pay posts made there. There are lots of sections in the forum that you can get paid, why bother on off topic section mate?
Why not if they're paying for posts in there and that's what he wants to know. If they do pay for posts in off topic then people are going to post there, but the issue is quality of content. People can make good posts in there but the manager will need to keep an eye on those that do but if he does then there shouldn't be any issues.
So, why you think you can leave negative feedback, when Yahoo is announcing Yobit's campaigns? https://bitcointalksearch.org/topic/yobitnet-signature-campaign-5188047 Why there is no your negative feedback too?
That looks fishy as fuck and looks like a scam to me. Yobit also uses .net not .ch. Are you sure you're not using some phishing website? It seems weird that a site would ask you to do this sort of verification and for such a high amount of money.