Looking at the first 2 pages of this section alone I see 1 user has started and bumped 7 of their own threads dating back years... It isn't really a problem with just new users. So long as they see certain individuals getting handsomely rewarded for this behavior, you can't really fault them for attempting it themselves. Be careful who you promote as leaders of this community because new users follow and the Bitcoiners are becoming few and far between here.
I think I know which forum member you are referring to and I don't really know what it's all about but it seems to me that you have had a confrontation or something and I'm not going to get involved. But I'll give you my honest opinion.
The difference between that member and the newbies/juniors I mentioned is that the latter open a thread (often in the hope of catching credit) and then don't respond anymore. They don't bump their threads.
In the case of the user you mention, he not only has 7 threads in the first meta pages. He has a lot of threads in various sections of the forum that are very useful and have earned a lot of merit for it. To me in particular I have found the one about fees very useful.
In other words
1) The behavior of this user is completely different from the newbies I mentioned in the OP.
2) You are trying to paint a picture that is simply untrue. It's not like he somehow gets too much merit because he bumps his threads. He gets a lot of merit because he has written very useful posts that have served a lot of people over time and that's why he gets so much merit. It is very relevant to bump those threads because they help a lot of people.