That has been going on for years, an item I was looking at would sell for $45.00 an identical item would sell for maybe $55.00 another same item would have a starting bid of $65.00 and the auction would end with no bids. When a real person would bid on it the item would go right on up to $80 or $90 dollars. The items that sold for $45.00 or $55.00 would be re-listed a few days later.
Just like a farm auction or auto auction, the seller bids on his own stuff.
Years ago a guy would go to all the farm auctions and buy stuff. Come next February he would have a big farm equipment auction at his place, he was the auctioneer. He had 4 sons who would bid against potential buyers until the item got up to the profit they wanted.
You would see the same item year after year sometimes.