The positives of JM's auctions seem to be the seller and JM's bank balances are improved, the winning bidder gets what they wanted, others who own a copy of a record that sells for more than usual get to feel good they own a copy and people on here get to debate the results.
The negatives seem to be some find they previously sold a record for far less, some find they own a bootleg, some may never now get to own a copy due to a price hike, others wishing they'd have bought a copy when they had a chance and people on here get to debate the results.