Interesting... now that you mention it I was wondering why the 1 guy in our guild sold a Daedric motif for 500g and a couple of days later bought some other epic motifs for also below 1k ea.
I thought it was just players who don't care about profits.
Interesting...
which you can "ignore outliers" with MM.
Could be someone messing with MM, but more likely it was a gold seller (and buyer) using your trading guild to launder the deal.