This is obviously someone who understands (eBay's) computer models and metrics around the threshold and ratios of good sales to bad. This is either done with inside info, or lots of trial and error.
Even if the metrics can be derived through trial and error, eBay can change them at any time. Yes she is always on top of it, it appears. Does she have insider help? This is a fairly lucrative game she has going.
Just sayin'...
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