Mistakes happen
A digit too many turns 4,500 into 45,000, and a bid is a binding offer. Platforms that refuse every withdrawal end up with a lot sold at a price nobody meant to pay and a buyer who will not complete, which helps nobody.
So most allow a withdrawal for a few minutes after the bid, while it is still the standing high bid.
Why the window closes before the end
Bid shielding works like this: an accomplice places an enormous bid that scares off genuine competition, then retracts it moments before the close, leaving a low bid from the shielder as the winner. The defence is simple — no withdrawals in the closing stretch, usually the last hour.
What a retraction does to the price
Withdrawing the top bid rolls the price back to the next legitimate bid. It does not erase the history, and it is recorded. Accounts that retract repeatedly get looked at, because the pattern is indistinguishable from the manipulation above.
From the auction floor
See how this works on a real lot.
Every listing carries its inspection report, its full specification and its bid history. Read one before you decide what it is worth to you.