We have a system to calculate a number over time whether ingame or not, in the TP buyback point system. If something like that was used to generate a figure based on hoard size, and create a 'usable over time' pool of spendable points, then these points could be used to power the Dragon RAGE strikes and not consume hoard.
Then, put back the hoard only item drops, and there is no need to stuff hoards up with dreadfully mundane mass produced items! It would also feel better than sitting on a huge pile of crappy old tools and spells, and introduce a better 'management' aspect to those attack types.