As mentioned by the other old timers here, there is technically NO difference between newly minted coins and new addresses created to receive coins. They are all the same and one is not any less tracable than the other. This is an old myth that has been around a long time.

That said there are people who are willling to pay a bit more to convert fiat money to BTC using the process of mining instead of buying it OTC or exchange. These people/firms want to acquire more BTC but do not want other to watch their addresses or exchanges to know their holdings. Thus for these people it makes sense and they will pay a bit more for the exchange.