I think I agree with your observation because I have also noticed that there are many good posts on the forum that deserve to get some merits but no one is meriting those posts. The one reason that comes to my mind is that the merit sources are much busy and that's why they might not be able to give much time to read all of the posts which deserve to get some merits.

I believe that the only solution we may have is to vote for some new merit sources on this forum, in fact I believe the forum needs some new merit sources. I have personally supported @Icopress's merit source application and I believe new merit sources like Icopress could support those posts with some merits. I hope that Theymos should consider appointing new merit sources to help those unmerited posts to get some deserving merits.