No. The only thing this forum gains from signature campaigns is traffic. It will survive without them. The forum probablky loses money because money that would be spent on forum ad slots isn't and is instead paid to users.
theymos could start a signature space auction to supplement the ad banner space auction.
So nobody liked my idea that bad campaigns should be banned, rather than a complete block on signatures ( which would kill the forum ).
It's a good idea but how do you do it. You can ban the signature campaign managers from the forum but there's nothing to stop them organising a campaign off-forum. You should tell that friend of yours to register btctalksigcamp.com ASAP.