As moderators we won't directly interfere with transactions. We can't really take sides and will remain impartial, unless it is obvious someone is purposely committing fraud.
What we will do if required is converse between buyer and seller if a stalemate has been reached in order to hopefully bring a solution to both parties. This may be the ability to email sellers directly using their registered email address, this circumvents the need for them to log on to see a PM.