Where is the data from? Just yourself?
I'm not sure how time consuming either of these suggestions are are, but my suggestions would be - If you aren't already doing it, consider excluding prices X percentage from the average price to prevent filthy ec resellers from easily manipulating it. Imo, that is the biggest problem with auction trackers. It's impossible to totally prevent, but you can stop people from auctioning a 5k item for 30k a few times just to raise the average price.
Also maybe consider adding the seller names/prices in plain text Wiki-style underneath the charts for quick glances without having to hover over each dot.
Either way, it looks good, nice work.
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