- Not looking at the offer's details before engaging in the trade
- Outright canceling the trade last minute (after having arranged everything) without warning
- Making a reservation, before outright jumping on another offer, again, without warning
- Making offers before going quiet, or outright vanishing, for days without mentioning it
Abuse of such a feature could be limited so only people who post in a sale/buy offer can be marked by the one creating the offer, and vice versa. Making it so it only shows up after X amount of marks from different people could limit the abuse possibility. Defining certain criteria (trust threshold, time since account was created, etc) to also be able to give such a mark could further limit it.
marcfrancois
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