Already removed gold trading between players. Take it a step further and remove all currency trading between players. No direct deposits to guilds. Guilds could still amass silver by taxing their members. Now the only way gold sellers could work, is by buying items, reselling on market, or advertising items to players. Would be more problematic for them instead of spamming x silver for x $, now they would have to acquire items and sell them. With the gold market flux, pricing items for them would be troublesome and time consuming.
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