2.) Reverb's sales history tracking tool on their platform is primitive and inherently flawed.
When an item sells on Reverb, and it's an item that is in the sales history database, the price that gets logged into the sales history tracking (and that you see displayed on the little plot-point chart) is not the actual, final price that the item sold for. What is logged is the final listing price that the item was listed for at the time it sold, which is the same price that you see on the ended/closed listing when you go revisit the listing after the item sold.
Ah. Thanks. I haven't sold on Reverb, so that clears up a lot of the weirdness I've seen (I watch Parker guitars pretty obsessively and see some sell for incredibly high prices while a nearly identical guitar will sit at a much lower price unsold for months).