Are eBay auction comps legit?

Last week, I spent a lot of time checking comps and repricing cards for upcoming shows. I have noticed a common difference between auctions and BIN sales.

At the end of the day, a card is only worth what someone will pay.

This article is definitely not meant to be a rant or complaint compilation. My purpose here is help vendors and sellers be a little more confident in themselves and their cards and also help buyers understand that sellers are not being unreasonable for ignoring certain c