When using auction prices to comp cards being sold outside of an auction I definitely take the transaction fees into account. If something sold for a reported $1000 but they included a 20% buyer's premium and a 15% seller's fee so that the seller only received $708, I'm looking at that as the basis for the comp. The money the auction house kept has no bearing on a person to person sale. Usually I'll end up somewhere in the middle where the buyer pays less than the recorded comp and the seller gets more money in their pocket. When doing this it's important to understand the fee structure of the specific platform the sale comes from.
I do this both when I buy and the rarer times I sell. I can tell you I've had zero issues when selling this way. Sometimes people disagree when I'm buying. That's fine. I just move on.
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