Here's a couple of simple ideas:
Everytime that a player tries to sell something: Query the amount of that something in the world. Apply a scale to the amount (If you want lots of swords, allow for a lot of swords) and change the sell/buy price.
Only allow Shopkeepers to have X amount of gp. He sells items, he get's gp. He buys items he loses gp. This of course will be griefed. But It's a simple way to get the non-griefers to learn to not glut the system.
A not so simple idea: Make crafting more difficult then it is. Make it take time, and effort. More then just farming. It'll help.
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