I’d like to share a story.
I used to own Round House. I bought it early for an inflated price to buy it just after it’s first Essen. It had the promos and expansions in. I was building up to sell it. A friend knew I wanted to see sell and asked what i wanted. I said £40 as it had the hard to get expansions. So still cheaper than a usual bit of MsRP new copy. He thought I was taking the piss as unbeknownst to me all the retailers in the UK had started discounting down to £20 for a new copy.
Then the next problem is that value is subjective. If someone has priced something wrong in your opinion I suggest being as gentle as possible as it’s their choice what to list it for and if you think they’re taking the piss it’s based on some level assumption on your part initially.
On that subject I’ve got a copy of Monopoly which I’ll give you for all your money and your house, thimble, dog, top hat and racing car.