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The reasons were all prepared. When Qin Yun releases the news that the Hehuan Sect wants to refine an evil treasure and needs to purchase these oddities in large quantities, it couldn't be more reasonable.
The most cunning part is, the wealth he spends on these resources is actually given to him by the cultivators present. Yi Taoist doesn't spend a dime and even makes a profit.
The ultimate level of taking advantage is plucking the wool without letting the sheep bleat. Everyone in the venue is shrewd, and even with Yi Chen's hardened heart, he can't achieve such a level, but making the sheep bleat less, Yi Taoist can easily manage that.
Trade, let the resources start flowing.
With the massive resources he receives each year, if he buys up ominous items or information at a higher price, won't the resources circulate back? Everyone gets what they need, and plucking the wool won't be so painful then. The various sects will have no choice but to serve him earnestly then.