Topic: Question about customary values in trades
Recently I tried to engage in a trade for 2 cards - Jace AoT, and Thassa. The total added up to like $40.60 or somewhere in that range (not really relevant). After looking at the person's wishlist, I selected 7 cards on it that added up to ~40.00, proposed the trade, and messaged the person to feel free to look at my list and see if there was anything else he might want, and to feel free to change.
He responded by telling me that he was incurring quite a loss, and that despite the difference in monetary value being ~.60, the fact was that he was losing 2 valuable cards, and gaining 7 moderately valuable cards. He essentially scoffed at my offer.
Is this the common understanding about the value of trades, or is this few an exception to the norm? I always focus on the monetary value of trades, and try to get them as close to even as possible. Is the amount of cards being exchanged typically relevant?