How accurate are your valuations?
Firstly all valuations are an "estimate".One thing that people do not understand, although they may have a valuable coin or banknote they think that they will get the catalogue price or higher. This cannot be further from the truth, it is extremely rare that a buyer/seller will get a higher price, usually it is lower.
NOTE: Coins and Banknotes are only as valuable as what someone will pay for them.