To be fair, the velocity of money can be be significantly higher in a video game, and you're much less likely to have innovations reshuffling the market. It seems inevitable that extremal states would be more prevalent than real life.
With the point "the velocity of money can be be significantly higher in a video game" you actually outlined a serious problem (and a potential solution):
The rest of the in-game economy (including its pricing) doesn't fit the money circulation velocity, thus we get problems.
