By the way, I just thought up of some epic additions for your game.
1) At the Grand Noah Colosseum, after the events of the tournament to get the orb from the queen, you could have it host a new minigame for completing three circuits of 5 enemies for gold and other rewards! The difficulties will be Contestant (easiest one), Contender, and Champion (Most difficult with the biggest payout of them all).
2) When we get into the Port Natalia region, you should put in the Mermaid Merchant from MGQ Paradox! She could be a new source of gold from combat (unless you add in more bandits), and to compensate the amount of gold she has, you can make her a difficult fight where she can use healing items and pseudo-magic items along with her normal magic.
3) In Grand Noah or Grangold (Basically any late-game city or town), you could put in a money generator in the sense of a Centaur Racetrack! Basically, you bet gold on a centaur, then the race plays out and if you win, you get a surplus and you lose gold if you lose; the way I see it you can make it random or do a gimmick of your choice, but it would still be a good way for us to make gold late game.
4) I got a wicked idea for a new dungeon and if you're a fan of the Dark Cloud games, then you'll love this idea.
Basically, you do a dungeon in a sunken ship and this can be a standalone dungeon separate from the Captain Selene ghost ship sidequest. It would have tons of gold, items, and other loot; and to sweeten the deal, you can add in new monsters like skeletons, ghosts (that you can only attack with Angel Halo or some pseudo-magic attacks), and other deep-sea beasties. Ultimately, if you want to, you can put an Angel Orb or a legendary accessory (Like one that lets you attack twice a turn or even have crazy speed on the rpgm wheel) and in order to balance it out, you'd have to fight either two powerful sea monster girls, like the Narwhal and Manta girl from MGQ Paradox, or one great big Leviathon (Not Levia from Paradox, but a legitimate Leviathon).
5) If you really like the first Dark Cloud, then this other idea is a sweet idea for you too, because we could take the Demon Shaft and put it into the game! What I'm saying is that we put in an end-game dungeon that spans over 500 Floors, but to make it easier, each floor will be a copy of a dungeon map, like from Selene's ship or one of the caves in the mountain where we fight the four bandits. But the twist is that with each new floor, the monsters in it get more and more difficult. To make it more desirable, there will be a vendor to sell epic gear and items, give you gold based on how far you get each run and gives you a key for a chest when you clear a 100 tier floor for the first time. Of course, there will be a mini-boss every 10th floor and a choice of a normal boss or a super boss at every 100th floor, and loot is given accordingly based on the boss beaten.
Suffice to say, I thought up the first four just two hours ago and the 5th one as I was writing this post, and once again I have to stop writing things in the morning.