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Good question Paul. If ebay tells us the listing had a best offer and it sold, then we will just remove the listing all together. This assumes it did sell for best offer price, though we never know for sure. We figure it is better to remove them entirely.
But the ebay API doesn't always give accurate data on best offers so sometimes we don't know if a listing had best offer or not. In that case those listings might be included even if there was a best offer.
I've started work on this. It is almost ready for some beta testers. If you are interested in beta testing, please let me know by emailing us your collection url to sales@vgpc.com and say "Cost basis beta"
I've manually added some sales data for that game now. Should show up on the site within 24 hours.
What were you trying to do when you got this error?
That is listed here already:
What ads are you referring to? Our site does not charge anything to look at the data or use most of the tools. You only need to pay if you want to download the data or use premium features of the tools.
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Good idea. I'll see how popular this feature suggestion is and work to add it if other users like the idea too.