If a Thread has more then 2 or 4 exactly the same messages like copy and paste (plagiarism) the thread get locked by the system !
Or if the Thread last 5 posts only "Good Projekt" the thread gets automatically sorted out and reported to the Mods !
Again, this would be easily abused by campaigns hiring bots to spam competitors' threads with identical posts and therefore get them locked.
I suggest bump of topic only happen when somebody who had earned 5 merits in last six month reply on it.
I would make the criteria somewhat stricter, say 5 merits in the last 30 or 90 days, but I like this idea a lot. However, it does still run the risk of creating a marketplace for certain users to sell their "bumping ability".