Maybe a nice idea:
Create2 new NPC's (1 biped and 1 dragon).
Which charge massive amounts of cash (500s to 1g or higher) for a permanent increase of stats.
The more cash you invest the bigger increase ONE of your stats...
No large increases though since I am well aware of the money gathering capabilities that are found in Istaria...
For a high price it might just make a difference in battle or while crafting...
And while you are at it give craft trainers the ability to permanently increasing your skill by paying large amounts of cash...