Such a sad state of affairs.... the lure of earning anything from $20 - $100 per week to promote the 1xbit scammers is enough for some to jump on the signature campaign bandwagon.
$100 per week is not bad at all. It is in line with the second best paying signature campaign, which would be the Best Change one. Now there are two more at those levels. This one pays that money for advertising a known scam site and then there is Stake.com, which with its posting requirements does not exactly encourage quality posts.
With $100 a week there are families in the third world who eat, and if you live in the first world and have a stable job, it is a good extra source of income. I guess that's why a lot of people end up advertising the site. If they paid a lot less, there would be a lot less people willing to destroy their reputation on the forum to advertise for them.
From what I observed, there were only a few participants who had a neutral trust. Most of the accounts involved in the campaign already had a red trust before, sometimes for very silly reasons, but this excluded them from participating in other campaigns.