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LoL yeah, much wisdom in that old saying.

However, we could always try to publish and list all the stamps, or as many as possible, in our account and then try programming our "smart evil bot" so that it works in a more cunning, stealthy, and random way without necessarily having to appear and bid in each and every auction. So that in this way, only in those few bids the bot participates, it actually forces potential buyers to always raise their offer without ever realizing the trick and therefore compels them to "consume the mushrooms" multiple times without noticing that they have been manipulated.

Perhaps this newer and witty sales strategy it's not quite perfect yet and we could continue refining it. But anyway, I have the hunch that by carrying it out, you could very likely obtain higher income from the entire batch of stamps than you might have originally expected.