Given the 'very rich' response, as well as the amount of items present on Natwaf, I wouldn't bank on more than 1k per person (also because taking an amount larger than that overwhelmingly skews any future auction events in his favor which would greatly damage what little game balance exists).
I must admit though, the idea of forming an assassination team just to remove him from the competition at this stage is now tempting.
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Currently playing: Terraria, Minecraft, Super Mario 3D Land