Well, I have now over 30k caps in my character. It's ridiculous. Any mod that GREATLY increases the prices of everything (shouldn't things like this be rare?)

Do you use FWE? You can increase it in the menu there.

http://www.gamesas.com/index.php?/topic/1079218-relz-arwens-realism-tweaks-thread-%236/ will make it MUCH more difficult to have enough caps.

This is done by addressing what I viewed as two main issues:

1.) I've changed the way Bartering works: Bartering skills are now a MUCH greater factor in how much you have to pay for items (and in how much you receive in trade). When your bartering skills are low, you're going to pay a huge mark up (and you're not going to get much in return). But even with Barter=100, you will still have to pay a 30% markup fee to buy anything, and you will never receive more than 80% of what an item is worth.

2.) Most food, weapons, and ammo are very easy to come by, as you can literally just pick them up everywhere for free. This module makes these items a LOT less abundant in the Wasteland. The end result is that there will be less free loot of this type, so you'll have to purchase more of these items from the traders.

Uh, you could also find a mod that taxes you. What? The government can't rebuild itself without money.

I never had that many caps. Uh, can't you break a bunch of weapons and then repair them. That will eat up your money faster than anything else.

Making items top expensive isn't the best idea.
FOOK 2 falls into this trap by making stimpacks worth more than mini-nukes.

Considering how easy it is to amass the former, it's not quite logical to increase the prices too much.

And Arwen, show me an example of real life 100 bartering skill. I'll show you a man who can trade a carrot for a car.

Thanks! Just what I was looking for!

Though you've found one good answer, consider Real Time Settler. There you must fund the rebuilding of a new settlement. You can really put your caps to work.