That's just crazy talk!
Instagram selling and live selling seems to have taken off in the past year. I get on those and see sales of books well past GPA, due to the rush of the auction or whoever is in the room. I also saw a pretty big dealer who is on here and has a flintstone type moniker (I would tag but not sure that is in good taste) sell a X-men 1 for below market in his live sale, while everyone else is selling 20-30% above last sale. And when he posted it, there were about 7 folks responding with the claim. A 6k sale with an army of people trying to buy it. I was one of them, but must have the slowest internet known to man as I was 4th.
At the same time on Instagram Star Wars comics are selling for twice what ebay is selling. I have complained about this since ebay started collecting taxes, with taxes ebay is a tough buy for me now, it increases the actual purchase price 7% in my state, so I would look elsewhere.