I don't believe it is shill bidding. NYstamps has a huge and dedicated following; they're past the point of needing to shill. They, like some other prolific sellers, have customers who bid JUST with them. I don't see anything untoward here.
That's a very thirsty customer, with not much collecting focus! The key to proving shill bidding is tracking the relisted items and the time between. I don't have the time and patience for that surveillance.
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