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runscottGrading is "subjective", so if a card is off by one grade I wouldn't expect a refund; two grades and I would complain. In my case there was an alteration to the card (small pin-hole), which is a completely different issue. There is nothing subjective about alteration, and any auction house worth their salt will issue a refund, which Lew Lipset did for me. If I bought a card from him as "ex" and it turned out to be, in my opinion, "vg-ex", I wouldn't say a word.
I had a similar situation with CollectibleClassics, and to be honest, I was actually wrong. But they cancelled the transaction for me before the card was even sent out, which was more than they should have done, and there were no questions asked.
I have only won one auction from Mastro prior to the most recent one, and not only did they provide excellent service, they sent me additional provenance for the item several weeks later, which I did not even expect. As long as the auction house provides a good selection, everything else is all about customer service in my opinion.