[ghaff]

>I think the problem here is that Ebay doesn't give any metrics on how frequent an item comes to market, nor does it give any pricing history for how much an object typically sells for.

I'm pretty sure you used to be able to search on completed auctions. I seem to remember doing that. But you seem to be correct that there's no way to do it now that I can see.

[mitsubishi77]

You still can; Advanced search > “Completed items” and/or “Sold items”.

[ghaff]

Ah. Thanks. I hardly ever use eBay any longer and I didn’t see that. Good to know. It’s sometimes useful.