Alright! Here goes a small one

There are a lot of clans who have their hoard set to open, and in order for the hoard not to empty out, the clans often have a rule of "take one give one" -- Sadly people seldomly follow such rules, which then ends up with the clan hoard having to be closed

I would suggest a new optional setting that works like a trade: If you want to take an item you have to give an item. Doesn't matter what item, and the trade does not have to manually be accepted (as to not put extra work on the clan admin's shoulders).
This could be done by adding a tick box: "set hoard to trade", and for the members it would show on the hoard as a dropbox you have to fill before or after you click on an item to take.

This would not guarantee an equal exchange, as one could just give a junk item instead, but it would guarantee that at least -something- is given, keeping the hoard alive.
Also, it would mean less hassle for the Clan admins, as they don't have to manually go through the take/donate list to send warnings to the users who only greedily take.