In a perfect world perhaps.
In this world if a newbie is spending such money without some kind of knowledge of his hobby then he is not being honest to himself and had better beware. Yes honest sellers are great but they are also human, and above all trying to make a living by getting you to buy their product.
There are some here that think coin dealers need to be saints to be in business, to them I just smile. Perhaps I am simply jaded, and do not collect in the realm where CAC is a major factor, but outside of online forums I have seen little interest in what CAC thinks.
If the dealer says 'yes it has' and the buyer still buys the coin, is he wrong?
Ultimately if one's most important concern is what CAC thinks then I question where one's heart truly is.