Please take the time out of your day to read this thread regarding skinscom.
It should explain their attitude towards customers after trade reversals, and the way the company operates.
Draw your own conclusions from this!
We handle things the same (or better) to P2P marketplaces - when a buyer reverses on a P2P marketplace they get banned and the seller usually isn't compensated with anything.
I think that the seller should have some responsibility for trying to dump overpriced items after an update. We work closely with our traders, and these reversals only happen after updates when for-profit traders try to take advantage of each other.