Some scammers bid with USDC or other currencies and some sellers assume they get bid in ETH. Some scammers did got NFTs with very low price. For example, the scammer bit 1ETH item for 0.9USDC. The seller assumes he got bid of 0.9ETH and accepts the bid. I observed at least 2 of these kind of sales and I received many bids like this.
Suggest to allow seller to block certain cryptocurrenties for bid. Or allow seller just enable ETH or WETH for bid.
Also suggest to allow seller to block some bidders who are known scammers.