I think that after spending some time on Bitcointalk and even by reading some replies in this thread, he will understand that there is something between sig campaigns and posters.
OP, signature camapaigns here work in two ways:
1. You hire a lot of people to promote the service but pay them low $ and then they spam the forum, get disliked by the community here and probably people less likely click on the signatures of spammers.
2. You hire high quality posters, pay them enough $ to keep them and your business will succeed. Bitsler, Chipmixer, Fortunejack, Sportsbet, Bitcasino and some other businesses are great example of how a well-managed signature campaign with good posters can help you succeed in your crypto niche.
You can check the signature campaign list, have a look at each Ann thread and then run one by yourself:
https://bitcointalk.org/index.php?topic=615953.0Or contact signature campaign managers:
https://bitcointalk.org/index.php?topic=5266629.0