Ok thanks I noticed some chests now have treasure. Maybe it's ok...lol
I found I can grind some serious gold in the prologue castle.
Yeah If I recall, it's gold coins, gold bags, each kind of subweapon (tornados, etc.), hearts, and stones. I definitely abused that area. Worth it to go fill up on subweapons too even after you've got all the stones you need to buy everything. You just have to go back to the town hub to get the chests replenished.