I disagree.We're forgetting the main goals of our existence in this forum,we're here for bitcoins and casting our opinions on the subjects rather than investing money for ROI in terms of signature campaigns.
You wouldn't lose that main point when signatures are taken from 'normal' users and only are allowed for some restricted group.
A better fix could be something more flexible,more efficient.Why do I see some campaigns causing less spam compared to other ? Managers ? Rules ? Fixed Posts ? Even though this seems like a complex option but could be analyzed .
It's not too complex, believe me.