I think there is a simple solution if the admins would like to put an end to this.
21. Old bumps and bounty reports should be deleted.
These three words added to the
rules would do wonders for the Bounties section.
Would be a great addition, but I don't think it will happen. Bounty hunters don't read the rules. Many of them wouldn't probably even understand what is written in the rules. Even if that became a requirement, I don't think they would spend time checking their post histories to delete old bounty reports. They would rather wait for the mods to do it themselves. That just creates additional workload for the administration, so I don't see that happening.