Exactly.
It's not your job to inform the seller of their lack of knowledge. It's also not the job of another bidder (a reseller as you claim) to give you the courtesy of a good deal for your collection. As you said yourself, it was an open auction. It's not "unfair" that someone who might resell the items outbid you by a dollar. It was within the confines of the auction rules. My point is that the "fairness" complaint goes both ways.
Your collection is essentially a portfolio of various stocks which you will keep for a long time. A resellers inventory is essentially a portfolio of a day trader. Different methods but essentially the same activity.