[1] Signature spams starts with manager. They are the one who hire spammers to promote their project. If so, why not restrict topic starters in Bounties section to some sort of paid membership ranks like "Manager" Ranks and the prices should be around $50 or somewhere near. This would make the companies to hand over their bounty management to only people who have bought those ranks or some good Managers who are affording to pay.
Spending $50 for a "Manager" badge would do nothing to reduce spam. Are you aware of the amounts of money flowing through these campaigns and the people managing them?
[2] People here keep reminding me that we are in a bitcoin forum and not in a altcoin forum whenever someone requests for some additional sub-boards in Altcoins. If it is so, then why should we allow the promotion of alts here? We could ban them altogether.
We wouldn't have to ban altcoins as they are a part of the crypto life but limiting the ways they could market themselves here would be greatly beneficial. For example, what if the bounty managers of these would only count the posts they are making in the altcoin sections? That would be hard to police but it could be a step in the right direction.
[3] theymos could easily implement a new rule such like, only those who received 10+ merits in the last 120 days could use signature? Will this work really? I need community suggestions. But there seems to be another negative aspect such that merit abusers would get those.
That could be one solution although it wouldn't do much. Another thing could be to only allow Sr. Members + to wear a signature that contains code (I doubt a lot of companies would want participants in their campaigns that could only wear a single line of text).