where can I find those threads?
They are added value for me for sure but I do not see any of them as pinned thread
You can find them at the gambling section but they are always buried since most gambling sites bump their thread daily. Just bookmark them so you won't have a hard time finding them again.
you can also click on the "watch" bottom to add these topics to your watch list. and from there you can always be informed when they are updated.
you can find the "Watch" button above the first comment and also below the last comment on the right side.
Reply | Watch | Notify | Mark unread | Print
and then from very top of the page click on your link called "WatchList"
https://bitcointalk.org/index.php?action=watchlistand you can see the watched topics.
also you can edit them by clicking on the edit button
https://bitcointalk.org/watchlist.php