Capitalism is the most godaw... oh, wait, this is about managing you kingdom? Ah!
Ok, so here's a guide for those of you confident enough and willing to restart for another profile, to help you grind out those locker and veto slots. Well, help in terms of the money haul not gameplay difficulty. It's experimental, but parts of it have been tested allready. It's long winded and repetitive, but I'm being indulgent and ultimately harmless. (And uneasy about advocating silly approaches to kingdom management because of what happened the last time I did that).
What you do before you restart the whole entire game is make sure to remember exactly how you managed to beat Gaan'Telet purist (the "end" quest). You need to be able to do it with a bare minimum of unlocks, with, say, a dwarven rogue or a human monk or somesuch. Not silly potions, either! The lowest you can go in terms of unlocks, the better (though you can unlock whatever you want, really, and having all the gods unlocked is probably a good idea).
What you do then is restart and do the intro dungeons unlocking whatever. I'm talking about the very first three dungeons, and not Den of Danger, Venture Cave and Hobblers Hold - you don't want to do those unless really, really, REALLY necessary.
What you do next is do the directional dungeons and visit the subdungeons looking for stuff to unlock - races, gods and such. You want to pick up all the throphies as fast as you can. The fewer runs you do, the better, and under no circumstances do a Hobbler's Hold run. Keep your runs in the first "outer" ring of dungeons to a bare minimum and just get those throphies. Possibly consider doing the bank and bazzar upgrades so you can upgrade other stuff along the way.
Once you've got all of them (and some can be tricky, but if you've got all the gods, not that tricky), "Beat the game" by doing a purist run of Gaan'Telet and stabilize your prices. This will also unlock the PQI and the Flaming Dungeons, and many, many quests. What you have then is THE GAME. Most dungeons will be uncompleted, most quests too, and the PQI and the flaming dungeons will set your objectives and give you lots of money for every run you do (even more with the "bet on boss" prep).
If you can pull it off, you'll be hauling 500+ gold on every run when the flaming dungeon or the PQI send you to the easy dungeons - VC, DoD and HH and the first ring of drectionals. Don't chase badges unless PQI sayes so - as long as you don't have full completion there's a chance you'll be sent to a dungeon. Chase badges in the dungeons you DON'T want to be doing anyway. Every time a dungeon with a quest in it becomes flaming, do the quest - eventually the quests will be completed and you'll get your flaming dungeon gold, too.
Also, as soon as you feel confident with your unlocks (do puzzles/class challenges and stuff) work your way to unlocking all the classess (monsters, exploration, etc). More classess, more 500+ gold runs in easy dungeons. As soon as you find tinker, unlock everything that unlocks through subdungeons - classess, races, gods, whathave you.
Last couple of playthroughs I explored the early game for balancing purposes and these kind of shennanigans I avoided on puropose, but on one playthrough I avoided Hobblers Hold by accident and only remembered it exists when it started turning up in the PQI. Every time that happened it was 500+ gold in a matter of minutes. So following that logic, the next time I restart, I'll try to do what I described here for 2 reasons - easy money on easy dungeons, and actually getting the feel of doing the game from scratch with the PQI and flaming dungeons turned on from the start. Plus, this way you get a lot more out of the PQI before it starts sending you off to Vicious dungeons.
This is probably the most efficent way of grinding gold in the game, by far.
EDIT: And once you open up the PQI you might want to practice what I call "badge avoidance" in the easy dungeons. Don't do more than the PQI sent you in there for, to leave more reasons for the PQI to send you back. This involves "sabotaging" badges except the one PQI wants. There's about 25+ reasons to be sent to hobblers, and that is 25X500 gold. You really don't want to waste any of it.
IMPORTANT BIT: Since the opening part of this strat is in fact the speedrun that the a dev said was interested in seeing done, if you could tape the "get all throphies ASAP + do Gaan'Telet" done part in form of a one piece speedrun, I guess at least he might appreciate it. Just a thought.