In a nutshell, as a collector and buyer, all I would like to have latitude to negotiate on is the price. I need to be able to trust that the coin pictured and described is accurately graded (to UK standards), well photographed (or scanned), with any defects or varieties highlighted, and is correctly attributed. If there is a no-quibble return policy then so much the better, but I have only used that on 3 occasions (i.e. it is as described but I have changed my mind) At the moment (after only 7 years of serious collecting) it is still very caveat emptor (which is fine), but it often means due diligence before parting with decent money, which must involve seeing the coin in hand before buying ... nothing new here I know, photos for distance selling / buying are now the norm, back in the day descriptions alone were all that was required One benchmark (and only one of the possibilities) is the grade returned if you slab a coin. Another of course is the price achieved when sold (but that is of course subject to market fluctuations). The difference in value, when selling, between mid-high grade and top grade for many coins gives a lot of latitude to anyone selling to 'big-up' a coin ... there seems to be a massive bubble building at the very top end ... to me Heritage seems like somewhere I would sell one day, but never buy!