I'm really sorry you're having such a bad run with the troll camp. The glue is definitely still dropping. Random drops can be very frustrating... I think that's why the adventures are helpful to try and get a glue or 2 that way and then others will pay the 20 gems for the item on the crafting screen. I hope your luck changes!
No need to 'subscribe'. That is a feature of the the program used to create this forum (vBulletin) that can be used if you want to keep updated on a particular thread. No fees involved at all. Personally I don't think anyone needs to use that feature at all. It's better to bookmark the thread (e.g Inventory Guide or Building Guide etc) when you're looking at the forum on your phone/device for easy reference. I wrote a guide on how to use the forum in the "Castle Story: Help and Information for new players" thread, so maybe that will help. Look at post 12 on page 2 titled * Information about the forum *. Additional info for Android users also included as visibility of the forums looks a little different to iOS users. Hope that helps!