There really is no option to block bidders with zero feedback. You just have to put the option that allows you to block bidders with NPB warnings against their accounts.
They get the -1 probably due to selling in the past.
Check the join date, anything less than a month, they get canceled right away. More aged accounts bidding on my item (if they passed the initial NPB block), I send them a polite message asking when they intend to pay once/if they win.
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