Just a guess that the bid levels are the result of many decades of experience across many auctions and are not nuts or crazy at all. And it works in your favor too -- if in your example you were the high bidder at 9k and that had been high market, it makes it less likely you will get outbid.
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My avatar is a sketch by my son who is an art school graduate. Some of his sketches and paintings are at
https://www.jamesspaethartwork.com/
He is available to do custom drawings in graphite, charcoal and other media. He also sells some of his works as note cards/greeting cards on Etsy under JamesSpaethArt.
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