Basic economics: Traders rely on price variation (buy low, sell high). If everyone pretty much agrees on a price for an item (historical and average price data provided by auction site) then trading becomes much less lucrative, since nobody really sells for less than value and nobody really buys for more than the value.
But if there's no set price (no auction site, no historical data) then it's the wild west again and those with more information (tunnelquesters) have a big advantage.
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