Providing QUALITY POSTS is essential to maintain Bitcointalk as a source of Bitcoin-related content and to prevent spammers from joining bounty campaigns.
I wouldn't make such an accent on bounty campaigns. Spammers create problems even when they don't wear any signatures. Not everything and everyone here on the forum care s much about signature campaigns, actually. Of course, the later could provoke more spam and shit content, however, in my opinion 1miau didn't mean that bounties are the main problem and the key reason why he created this thread. It is more about conscious behaviour here on bitcointalk and preventing deeds that destroy forum and its community step by step.
I have noticed one thing about quality of posts made here in the forum. There's a very nice tool that will enable anyone to constantly produce quality posts in the forum and that is
"being conscious of quality always".
Whenever anyone opens their computer to make a post in the forum, if they are quality conscious, there's a very big tendency that the person will produce quality. Quality has nothing much to do with signature campaign. I good poster will always be good whether or not they are wearing paid signature. A poor poster will only try to improve their post quality in order to decieve a campaign manager to hire them, but as time goes , their post quality will deteriorate.
So, for the benefit of the forum, it is important to have users develop a good posting habit.