I'd say it comes down to the factual accuracy in the OP. If they're posting prices of some comps, well that's sort of what I assume many people with something to sell will do. If they're just saying, "Look, here are some similar cards and what they sold for," they've done nothing wrong. Maybe those are the five most recent sales, or maybe they're the five most recent sales on eBay, or maybe they're the five highest prices of the ten most recent sales. In any case, they aren't anything other than what the seller presented them as. If they claim these are the most recent sales but have omitted one (or more), whether by accident or to deceive, then I think it's good for someone else to post the missing data. Otherwise, that's not called for.
Which is to say I'm fine with sellers as long as they're posting the truth and nothing but the truth. It need not be the whole truth, however one might define that. And I don't think it's good for the spirit of the forum if people are posting additional information detrimental to a seller who didn't post anything incorrect to begin with.
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