For those who are not aware of this:
The worth of gems you buy at KEMO auction is fixed. You can buy a ruby or obsidian for twenty millions, but it will be worth for RP and spell mechanics as by the standard game mechanics.
It does not work as in Order of the Stick.

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It is called swindling and only the richest or desperate will buy the gems at these ridiculous prices. Newbies, be aware of this. I would be okay with this if you got any mechanical benefits from goods, but you should know when you are overpaying for the RP instruments.