In Morrowind, 75k gold is like 750 gold in Oblivion if you know glitches/methods. And in Oblivion, just get your mercantile to master, invest in a shop, raid a dungeon over and over... Daedric/Glass should be flooding your inventory, sell it...bam 75k....
None of those should happen, or be taken into consideration when making the game.
- Glitches/moneymakingmethods: Most people don't know them and only might learn them after extensive gametime or by looking around the net. You can't build a game just for the professionals and cheaters, otherwise every game would only have a ultra hard difficulty. Developers can try to prevent the glitches to fix this issue a little.
- Not everyone is a mercantile master. 1 fix is to make it harder to level up.
- Daedric and Glass shouldn't be flooding everywhere.
Just play Oblivion on low levels when there are no super armors around and don't use any of the unthinkable moneymakingmethods. Getting a few thousands is suddenly a huge chore if you only collect pearls, hunt pelts or sell old iron items. Right now I'm going negative. Fixing armor and weapons takes 10 000 easy, I have to keep looting Glass armors everytime I get the chance just to cover that. Like said: Everything depends of everything, every choice and change to the currency system affects every other thing about currency. It's really hard to give ideas.
Problem of Morrowind is that there's nothing expensive and interesting to buy. Oblivion fixed it.
Problem of Oblivion is that there's great armor everywhere to be looted. Morrowind didn't have that problem.
Personally I wouldn't do any changes to the money until I see both of those 2 things done right in the next game. We earn less yet we still have all the thousands or tens of thousands costing items. Then I will start thinking about fine tuning prices and adding multiple currencies.