Signatures paying ..... scraps so not my cup of tea.
I also hate referral crap, which ofcourse i allways refuse.
The ones giving you the scraps are making the big money and laugh so hard about those doing them the pleasure for making almost free advertising.
It's win-win situation between owner of signature campaign and bitcointalk users.
Some people (probably have their own business) will not following signature campaign although they will got paid in big rates.
But for others people (probably freelancer/employee/worker) if they smart, of course they will use signature campaign.
Because even though they not use signature, they keep making post on here.