In RPG's, be they single-player or MMO's, I could probably be called a kleptomaniac, miser, and rampaging looter all in one. Even when it does not matter how much I have, such as in Single-player games where not much is bought from vendors such as Fallout 3, I am *extremely* tight with in-game wealth. This was very true in my WoW days as well, which is part of the reason why I quit that game with over 600,000g (though I made that through massive investment-driven crafting industries). But this behavior also happens in strategy games too such as Civilization, where I try to suck money out of rival powers and hoard it all for myself. But most of all? I take everything from places that I visit. If it can be looted, I grab it. Everything must be taken and either stored in my home/bank or sold to a vendor.
In all of my games where it is possible, the wealth of the world is pillaged, taken, or stolen and put into my own hands for the sole purpose that I find hoarding massive amounts of currency, yet almost never spending it unless its to make more money, to be good sport.