In my current save I have more money than I know what to do with. The game starts to get boring when gold becomes meaningless. Where's the fun in looting dungeons if you can't use the plunder you sell to buy new stuff? I wish the merchants sold a lot more really powerful enchanted items.
While not solving the problem in the way you asks for, Enhanced Economy was designed in order to solve the problem of things getting boring when gold becomes meaningless. It does so in a number of ways:
* Reducing the amount of valuable enchanted loot found
* Reducing the value of the enchanted loot found
* Making merchant prices much harsher
* Making merchants not have infinite gold
* Increasing the house prices
* Adding a weekly tax for the houses you own
The mod does way more too, but those factors are most important for not making you overly rich too fast. And all of them are configurable in the ini.
Fixing this is tricky, too, because the biggest income is from magic items that you find and sell.
As said above, that is one of the things EE can fix - reducing the amount of magic items found in the game. I have set up my game to reduce the amount of enchanted rings by 80% (as an example).