[intended]

He didnt create a market - left to normal dynamics in video games, the resources would have been distributed normally, probably more efficiently on average as well.

Check WoW out for example - the analysis on the spreads, ideal prices to sell ores, gold, are at OCD levels of accuracy.

Addons scan the auction house for undervalued goods, undertake pricing strategies, hold historical data on those goods and allow people to know whether an item is under or over valued.

Websites are dedicated to identifying prices across all the servers and that leads to people doing cross server arbitrage.

He didn't improve the market, he just made a monopoly. A pretty cool one at that.