As many others have stated, the coin doesn't change and should be valued the same whether they are graded or raw. What does change with TPG grading is the liquidity of the coin. So while the potential value of the coin is unchanged with grading, the number of people willing to pay that price drops dramatically if the coin is raw. And while many people in this thread seem to think that education is the key to being able to avoid the problem, they will find that the problem will once again rear its ugly head when they try to sell. I don't refuse to pay full retail for a raw coin because I am unsure about my grading abilities, I refuse to pay full retail because I know that when it comes time to sell, I will need to have the coin graded if I expect to sell the coin in any reasonable amount of time. And although I may be very confident that a coin is a certain grade, I am not willing to lose hundreds or thousands of dollars on a coin because the TPGs think I overgraded the coin. For that reason, I almost never pay more than full retail price of the grade below what I think the coin will grade. So If you try to sell me a raw gem, I will pay MS64 money for it. Have the same coin graded by the TPGs at MS65 and I will gladly pay your MS65 price. Lastly, there are a whole bunch of people in this thread who are regurgitating the mantra that coins are for collecting, not for investment or profit. There are also people in this thread who routinely sell coins for profit. And I submit that there are even people who reside in both of those groups.
It wouldn’t be CT without someone making condescending remarks to somebody. Hell, it wouldn’t be numismatics without it.