It would be great to see an average "review" scores on games on your website, such as Amazon or Metacritic provide. You might be able to screen-scrape review ratings from those sources. I would love to see both pricing info & basic overall review scores! That way, I'd know to keep a 4.5 star game worth $2, but ditch a 1 star game that's worth $100 for some odd reason. I often buy games in bulk, and it's difficult to decide to keep games or sell them. I often don't care much about "collectibility"...I only want good, fun games in my collection. I'll sell the bad ones that are worth money.
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