In an auction there is no asking price to judge. The price is whatever the second-most-determined person was willing to pay, plus one step.
That is a genuinely different thing from a shop price, and it protects you from one problem while leaving another.
What it protects you from
Being overcharged relative to the room. You never pay a number somebody set for you. You pay one step above where the next person stopped — and if that is above your ceiling, you simply do not win. How auctions find a price
What it does not protect you from
Your own enthusiasm. An auction will happily take a number you regret, and the room is not a valuation — on a quiet night it is two people, and two people can be wrong together.
So the fair-price question has one real answer: decide what it is worth to you before the item comes up, and let the room have it above that.
Four things worth checking first
The start price against the reserve. A low start is a hook, not a valuation. If a reserve is not met the item does not sell, which tells you the seller's floor was higher than the room's ceiling. What is a reserve price?
Whether delivery is in it. A cheap win plus an expensive parcel is not cheap. Shipping is shown before you pay, so look at it before you bid, not after. How delivery is charged
What the same thing has gone for. Not a feature of the app — this is ordinary homework, and for anything you buy repeatedly it is the single most useful thing you can do.
Condition, specifically. Most apparently-unfair prices are a condition misunderstanding: two items that look identical in a photograph and are two grades apart. What do NM, VG and the rest mean?
The one unfairness Metzee does police
Bidding on your own items, or getting somebody else to. Driving your own price up is on the not-allowed list and is the kind of thing accounts are suspended for rather than warned about.
So the price you are bidding against is other buyers, not the seller pushing from behind. That is the part you should not have to take on trust, and it is enforced.
If an item goes for more than it is worth
It happens, and nothing is wrong when it does. Somebody wanted it more than you. The next one will come around, and the discipline of letting it go is what makes the one you do win a good buy.
For sellers
A price only looks unfair when the description did not explain it. An item fetching less than it should is usually photographed badly; one fetching more and then coming back was described optimistically. How to price for auction
More: how auctions find a price, what is a reserve price, why is the price jumping.