There is yet another reason, one that is very dangerous where relatively unexperienced collectors are concerned. Sometimes (OK, many times) a dealer will have a coin that really isn't all there for the grade, and then a potential buyer (aka schmo) walks up and asks to see that coin. The dealer quotes him a price and, while the customer is examining the coin, the dealer then suddenly drops the price a significant percentage (say, 10%-25%) in order to try to hook and reel in the buyer. What the dealer is trying to do is DUMP the coin on someone who doesn't understand what he/she is thinking about buying. This happens all the time.A few years ago, I walked into a local coin shop, saw a PCGS MS66 1921D Morgan $1 on display, and asked to see it. The obverse looked great, and while I was studying the coin, the dealer then quoted me a very reasonable price (ca. $1100; I expected $1300). I flipped it over to look at the reverse (the strike was ROTTEN), and the dealer quickly dropped the price to $850 when he saw the look on my face. That annoyed me, because I immediately concluded that he thought that my sense of greed would prevail. I remarked about the poor strike, and he said that all 1921D Morgans look like that one. [They don't, and I had three of them in MS65 in my collection--all fully struck.]. I passed, and quietly watched that coin sit in his display case for more than a year (and he had taken it with him to Long Beach 3 times before he sold it).Make sure that the quality for the grade is there, then worry about the price. Not the other way around.
You missed my point. The coin wasn't all there for a 66---that is what I was looking for, not a 65 in a 66 slab. As such, I wasn't interested in buying it period.