You down play the contribution that Bounty and Signature campaigns brings to this forum and that is wrong. One of the major magnets for this forum is the fact that people get paid for their contributions. A small percentage of "good" posters gets an opportunity to "earn" some money from posting, because these people are held to much higher standards, than non-participating members.
The Bounty/Signature campaign members are forced to add constructive posts, where ordinary members can basically post rubbish, with little or no consequence.
The Bounty/Signature campaign members also add activity to the forum, something that is very important for advertisers looking for a platform to advertise their goods and services. <These are ads that are paying the expenses to run this forum>