I believe the performance chart is a crucial tool in selling! Myself I use it to track my items. If one of my items is not being viewed or favorited then I need to consider changing out that item for one that will, or maybe I need to change the way I have it listed. The performance chart let's me see these important statistical facts at a glance, saving me time and work that would have to be done tracking them myself. Another way the chart helps me is in the ratio of views to offers. If an item gets 309 views, but only 3 offers, that tells me that my price might be to high. Even when I've done all of the homework on an item it's still only worth what the market will bear, or in other words what someone is willing to pay for that item. The chart helps you judge how your pricing alignment fits in with like or similar items being sold in the same market as yours. I'm not trying to teach anybody anything, lord knows I'm no "expert", but I know what works for me.
As a seller, I would love to see more reporting tools. For instance I would love to type in a key word and see if any sold on offerup for the last year (locally and shipped) similar to seeing the solds on ebay. I know this isn’t ebay but I like that option because it helps me price optimally to sell.
I like the way you think!
Currently, the "sold" price/item data cannot be objectively verified, unless the items are shipped. The aggregated raw data would be flawed, since there is no verification process or OU handshake that takes place in real-time for local pick-up transactions involving cash (especially reporting the actual sold price).
In addition, unless all users opt for shipping, the performance data is way off. For instance, if a buyer in NY clicks on an ad posted in CA (since the shippable option is preset to default unless the user "unticks" it first), but the buyer is only considering local meet-ups, the collected data would be flawed.