Personally, i dont think the posts are particularly interesting or especially unique or have anything important/helpful within the context of the threads where they were posted.
And you are right to say that. Even quality and well thought post don't even receive that kind of amount from one person anymore. The thing is with merit abuse we cannot always link them to each other not until we see a more convincing story that they are abusing the merit system. What I mean about that is they excessively abuse the system and they from sending high volumes to particular people which also them are sending it back to him. Without any kind of links in the merit system whatsoever the merits are likely bought from someone.