Improve listings

Every active listing gets a priority from what the numbers and the catalog audit say about it: a price below the melt floor counts most, then being rarely seen, seen but rarely clicked, and title or item-specific problems. Results of earlier batches move these weights: a kind of fix that has helped ranks higher, one that has not ranks lower. Seen per day is impressions over the last 30 days of eBay's traffic report; click-through is views over impressions; from search is the share of impressions in search results. The audit re-reads 25 listings every third hour, so every listing is read again about every day and a half.

The suggested batch takes one kind of fix at a time (titles, item specifics and template text, or price and offers), alternating with the last change set, so its result says which change helped. With 10 or more ready listings, it pairs them by priority and holds one of each pair back unchanged: those are the fairest comparison, and they get the same fix after the result. Listings changed in the last 18 days, waiting in a file, or held back are left out until their result is in.

Each recorded change set is judged as a batch. Visibility changes (titles, item specifics, descriptions, Store categories) are judged on how often the listings appear per day, in all of eBay and in search results. Price and offer changes are judged on sell-through: the share of the batch that sold within 14 days, because every listing has one item. Each batch is compared with the listings held back from it when there are at least 5, otherwise with similar listings that did not change over the same days (same coin type, or everything else), so the Store, silver moves and the season are not credited to the change. A listing changed by another batch within 14 days is an overlap; when enough listings have no overlap, only those count. A batch is complete 18 days after the change (14 days plus eBay's 3–4 day reporting lag) once the traffic report covers those days.