'Used' bitcoins can often be tracked back to their original source, allowing anyone to view the transactional history of that individual coin. Consequently, a bitcoin that was involved in illegal activities can be tracked and potentially blacklisted by certain entities. Virgin Bitcoin does not have this issue, as it has no transactional history and is distinguished from its 'used' counterparts.
Due to the valuable characteristics of Virgin Bitcoin, some entities will pay premiums for it. These are often institutions that prioritize regulatory compliance and risk management, and include both financial institutions and law enforcement agencies. The premium reflects the expense of mining new bitcoin, rewarded to miners for the provision of computational resources and their contribution to the network's security.
Virgin Bitcoin is most commonly available directly from miners, and its availability is limited due to the nature of Bitcoin's mining process. The rewards from mining are 'halved' roughly every four years in an event known as the 'halving.' Consequently, the number of new bitcoins continually decrease over time, making Virgin Bitcoin more scarce and potentially increasing its future value.