Thank you for this perspective. I haven't even thought about this.They've done this with a few products when they stop selling them, massive discount sold as "demo models". I got some Aeons the same way a while back. In that case, A2A stopped being an official supplier for DCA. I assume they want to clear their remaining stock but the manufacturer won't let them discount it that much unless they label it "demo".
I saw the M9 deal on Ozbargain and was tempted but back then I thought I wanted Moondrop S8s. A few more reviews and thinking about it though I kicked myself. Luckily I've found some used on SNA.