As of the most recent Direct, we've added this rule:
Nothing foolproof, but hopefully we can make better adjustments in the future.
There's always a lot going on around here, so admittedly there's a lot that goes under my radar. If you guys happen across a topic you think needs a bit of moderator intervention, then by all means hit that report button (it'd help us out a lot).
When hosting an auction for your items or moving villagers, you must follow through with the sale unless you explicitly stated that the auction results are subject to be changed. Otherwise, the auction winner may give the host negative feedback for failing to complete the sale. The auction winner may also receive negative feedback if he or she fails to follow through with the purchase. Include as many rules with your auction as you feel fit, such as starting bid price, time limit, and bidding increments.
Nothing foolproof, but hopefully we can make better adjustments in the future.
There's always a lot going on around here, so admittedly there's a lot that goes under my radar. If you guys happen across a topic you think needs a bit of moderator intervention, then by all means hit that report button (it'd help us out a lot).