eBay has become rather iffy as a way to estimate values of film photo gear. Many sellers list items at exorbitantly high prices on Free Listing Days in hopes someone will bite. These prices are then taken by the clueless as being the true value of the item and they then list them at that price as well, further contributing to the false impression of item values.
Even checking "sold" prices can be risky as we have no way of knowing if the transaction was actually completed or was only a ruse to inflate prices of similar items. I know of one particular film photo seller who told me that he does this so I don't doubt there are others. There are other tricks as well that result in falsely high "selling prices" but I'd rather not provide detailed education on them.
So, when you see a few examples of a certain item selling at a very high price but many of the same items failing to sell at lower prices, you should be suspicious. Only take a range of prices that seem consistent and even then only take it as a range. There are many variables to used gear values.
Another major variable is whether the item sold at a fixed price, best offer or auction high bid. An item that sells for, say $100, at auction with low starting bid will likely not sell at that price if listed for a $100 fixed price.
These things apply to film photo equipment. Digital stuff and many other items follows different rules due to their mass appeal.