The dev team are always introducing gold sinks; so here's my briefly sketched idea for a new taming feature incorporating that concept...
What do the greatest dragons in fantasy usually have? A cavern full of treasure of course. So let's say that as a house lock down, you need to put aside a small "Horde Room". Treat it like the plant beds now, a multi tile construction, added via a deed, but which needs physical space. Maybe 8x8 like the Codex? So you've already got to sacrifice space to place it; Then you also have to sacrifice enough gold and jewels to make it visibly attractive and financially impressive...
Maybe there's also a weekly charge for having it installed? Call it "Thieving Hobbits Cost", as every week one little sod gets in and steals something expensive, which much be replaced with more gold.
Then, you must go into the wild and subdue a particularly fine creature; my own preference would be something with an Ancient Wyrm skin, and let's say a small but significant strength boost over a Greater Dragon... 5-10% over all stats and skills maybe, depending on balance. But what ever it is, make it stronger and visually more exotic than what we currently have.
It has to be beaten down first though using the subduing code we already have. Once beaten, it then has to be temporarily stored inside a crystal or ball, to be taken back to your home and shown the new treasure pile. Roll against taming skill to get it into the container. Normal skill loss rules apply of course on capture.
Once back at the home again, the crystal/ball is broken, and assuming there's enough gold and jewels in the horde to appease it, the dragon now stays; the horde acts as ONE extra stable slot, only for that creature, but when stabled there the dragon is left visible to all, animated counting and playing with the gold. It acts as impressive house deco when not out hunting, roaring and greeting people to the house.
If the horde isn't good enough, or the player lets it decay below acceptable limits, the dragon escapes, kills the taming owner only for his presumption (if he's nearby, and him only to avoid griefing anyone who has the horde item deployed), and then is gone for ever immediately afterwards.
I'd say let owners recover any remaining gold, like vendors currently work, if they decide to give up such a magnificent beast. So... whaddya all think?