I like the discussion. I posted similar analysis of the NA version over on oldscratch's site in 2017, but included just about everything that could be counted, gold, items, artifacts, secret doors, traps, etc.
Pertinent to the conversation is this excerpt from my post over there, which is relevant to NA version and rules (no furniture searching) plus all expansions:
To account for the Treasure deck we need to keep track of 1.) how many treasure cards there are, including growing the Treasure card deck once we get to an expansion with added treasure cards, 2.) how much gold there is to find when one complete exhaustion of the Treasure deck before cards are shuffled back in and the deck is remade (assuming you are strict and keep the deck static between Quests), 3.) how many rooms there are to search per Quest, and 4.) how many pits there are per Quest, which can also potentially be searched. Once you add up rooms, or rooms+pits you can calculate how long it will take to cycle through the Treasure deck. As soon as you've cycled through once you can assume that the maximum gold has been found -- if you allow Gold/gems/jewels, etc to go back in.
So here's what cycling through the Treasure cards looks like:
Note: Base = NA HQ, KK=Kellar's Keep, ROTWL=Return of the Witchlord, WOM=Wizards of Morcar, ATOH=Against the Ogre Horde, EQ=Elf Quest pack, BQ=Barbarian Quest pack, DC=Dark Company from Master's Edition, TGOTH=The Gathering of the Hordes, TDOTT=The Destruction of the Tomes
And here's how much gold the party can find during the course of adventuring, including all gold listed in the Quest notes, rewards for completing Quests, and gold from cycling through Treasure deck (with and without taking pits into account). The "*" on the chart is the Quest where the notes say the Heroes lose all of their gold. WTF. Always thought that was brutal, but in the big scheme of things, as long as they've been spending most of it on potions, they can potentially earn a lot more. This is the maximum though, in reality it'll be less.