As a non-experiment user, this is how i see things:

The problem is not limited to sig campaigns, when to look for new improvement ideas, but with Bounty Campaigns in general. [Let's mention signatures/translation/moderation campaigns, as the other bounty parts haven't so much importance]

Problems that need to be solved:
- Spammy posts.
- Thread Boost.
- ICOs/Projects run by scammers.
- Fake managers.
- Fake translators/moderators.

So let's admit that this is basically fundamental and should be set long time ago, typically for both managers and participants:
I can't understand why this is, completely, ignored since set.

And as the forum will never take part of the money involved in bounties, here some suggestion that can be, if ever, taken into consideration:
- Like "Copper Membership", users have to pay some fees in order to start new threads in Bounties board (Let's say something between 200 and 500 dollars) as not-fake projects can pay this small amount or to hire a good rated manager who already paid that fee to properly start monetizing his services. Forum users can only comment in existing threads of Bounties board. Collected funds can be used to hire more stuff to moderate the Bounties board.
- Only signature campaigns for Btc can be posted in the Services board and managers don't have to pay the fee like in the Bounties board.
- Managers can't edit their bounty threads or remove links to spreadsheets, they can reserve first comments for updates or change of the rules.
- Participants of the signature bounties (announced out of this forum) are responsible about their posts/signatures/translations and some restrictions can be set to reduce spam boost and fake translators.
- Merit requirement for translators/moderators.
- Merit requirement for participants of signatures campaigns that paid Btc.

Totally agree.