Two things in that one sentence.....Firstly dealers have a differing degree of what s a VF coin and EF coin, so that`''s where you come in, you have to know your own onions in that respect. Spinks quoted prices, well, take those with a pinch of salt. Then there's pricing, this comes from varying factors, grade and rarity are 2 of the most important. You mentioned a George V Crown on this website, but never mentioned which or grade, you did mention Spink however, Spink is merely a guide, rarity has no guide, nor does high grade, plus rarity.. Sorry, I missed stating the detail of that coin for sale here - it's the 1927 proof Crown. Thanks for the comments about Spink - I guess I am trying to understand that judgement you are referring to. It can't be an exact science I suppose and at the end of the day it would be limited by how much someone is willing to pay for a given coin, yet again you don't want to be a sucker and pay stupid money...