Due Diligence issue?
I generally agree that changing the rules would be akin to opening up a can of worms.
An issue like pricing/value (or grading) practically includes subjectivity. As the specific question you asked was about publicly available and easily accessed information, I think the responsibility for due diligence is on both the buyer and seller. We frequently discuss "caveat emptor" and "eye appeal premium" - perhaps the seller is noting cards that he believes are the closest representation to his regarding that? I know anytime I am looking at purchasing a card, I could care less what "comps" a seller is providing - I do my own homework.
That said, I think you could handle on a case-by-case basis a seller who is in your opinion repeatedly & purposefully trying to dupe.
A grayer area to me would be calling attention to cards or items with known controversy that may not be as easily accessible. I recall a thread recently where the authenticity of certain sealed packs had been discussed in an article which the poster linked to in the thread. Another example would be a card that someone knows/notices has been called into question as to it's alteration by BODA (with a link to the appropriate page). Not sure if/where to draw a line, but something like this would seem like a better argument could be made than for "simple" pricing.
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