From what I know I think the signature campaign does pay well, all you need is a good rank with right posts but off late too other campaigns does pay well too like the content creation with much percentage given to that campaign.
Content creation gives more percentage but it is just of limit numbers of participants accepted unlike on signature campaigns. But it is sad to know that some person tried to copy others profile link especially for high ranks members to participate and received rewards without doing anything. It could be u fair for the others and some BM haven't notice it(double entry).