I agree with you in principle, with two caveats. firstly the qf points are not owned by the member, they are retained by qantas. not that that really matters in the grand scheme of things, if someone want to sell them and can get away with it then its not for me to police.
however, I was concerned for the buyers. overly inflated prices, and the potential for fraud. it seems the bidders are highly inexperienced travellers, otherwise they wouldn't be bidding unrealistic sums to buy the miles. so they probably don't know what they're getting themselves into... possibillity for qf to cancel the transaction, possibility they could try and fly and have the ticket seized at the airport. and then good luck to them trying to get their money back from the seller, who has to be slightly dodgy because they know they shouldn't be selling them in the first place.