OP, in my opinion there is no real way to make it fair especially when only one source is primarily used especially when it's a source that only shows a limited history and it's a cash exchange which means at that moment it sold for x amount and no cards exchanged hands on each side.
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I'm not fond of wasting my time with folks who can't bother replying to trades or pms. If I don't reply, you're probably on the ignore list.
I'm not fond of wasting my time with folks who can't bother replying to trades or pms. If I don't reply, you're probably on the ignore list.