Please explain why necrobump threads are automatically closed

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https://bbs.archlinux.org – I write this complaint because there have been several times now where I've used Google or the forum search to end up on a topic that looks like it might be the solution to my problem. I spend a good few minutes reading through the thread, and oftentimes I'm on the verge of finding the solution, only for it to reach the end where an admin has locked the thread for "necro bumping". Then I have to do another search and frustratingly not even find a solution at all. I understand that if someone has a problem they should use the search feature or create a new topic for it rathe (HowTos)