The price of a 1918KN (or any such scarcity) is not really relevant, especially as you seem to have plucked a single price guide 'out of the air' so to speak. A coin like that will go for whatever someone is prepared to pay for it, and if that someone has deep pockets then what it says in price guides can be safely ignored. Yet on a different occasion, the same coin may go for half the amount as on the first. Your strategy - if bidding - is to bid up to the maximum you are prepared to pay for it, and to hell with the price guides. 2k ouch