(typo: meant thread not threat , above.)
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Marketplaces should do one of these:
Show buyer info, hide seller info, or
require refundable payment.
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Also in case of Dan, accepting an offer, making an offer, cancelling an offer should be a 2 click process,.
What can go wrong: buyer types cents, or types amount in its own currency, and submit price, and then regrets, but can't fix it.
If offers are legally binding, there must be an opportunity to make corrections.
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I wonder whether anyone was able to sell a domain which was "sold" but not paid, by force (legal action, or a letter from an attorney) to that buyer.
Most people are ignorant, but at the same time , letters from attorneys are very powerful, then they would respond with an excuse starting with: sorry,..