Comps will be used when available to negotiate prices to buy or sell.
If they are recent and fairly close (say low $750/High $900 with more in that range), then a nearer the middle price would be a good starting point. If a dealer has the card priced at $1200, forget trying to negotiate and move on. If priced at $900, negotiation might just work but don't expect to get the $750 price.
I have been a dealer for 35 years and I can assure you I rarely expect or get my asking price unless the card is literally on fire. It is a starting point. I also never price where I can sell at half of the asking price and make any money.
An item you likely cannot find again is another situation. I will price it based on the fact that no one else has one for sale.
In that case, it is "shoot for the moon" and hope to find the one buyer willing to pay that price.
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