Inflated price on figures.

I just wanted someone's opinion on prices. I wanted to buy something out of stock second hand on mercari but the price is triple what it sold for. What justify people people not making a few bucks but go beyond that and completely ripping them off? Yes I know the item is out of stock and a that makes it a bit rare but if everyone is triple pricing and nobody is buying why keep the price so high? The item is 300 but selling for $1000. Do people really bend the knee and suck off the seller yelling daddy for providing thr item for the crazy prices? I refuse to bend.sorry got a bit crazy at the end.