The asking price for an unsold item is only evidence of a price ceiling, not the item's value.
To provide a statistically significant estimate of the value of something requires dozens of verified sales. Few if anyone has access to these sort of data.
Price is relative to how fast you want to sell something. The faster you want to sell an item the lower the price has to be unless the item is both rare and highly desirable.
Condition and price are exponentially related. Super clean items sell for more and sell faster than beat up items.