Signature campaigns aren't created by the forum, move this thread to Service Discussion.
Signature campaign for Jr.Member is wasting money, currently there are many Full Member+ without campaign. It's not all about the post quality, it's also about the signature you wore/visibility. Jr. Member can only wear plain text with very limited characters, how it can attract people to see his signature?
There are still people who join with genuine interest, willing to learn and contribute if they have a reason to stay active.
You said they have a genuine interest, then in your last words you said "reason to stay active", so which one? it's the genuine interest or signature campaign? don't mix it.