Mining has become a business and it’s growing. It has daily expenses and for that miners need to sell their BTC to cover up electricity bill and other cost if exists. But is there any known miner who has not sold their BTC for a single time who is mining for a long time now? We know there are addresses which haven’t moved their BTC for a long time. Is any miner included in the list?
If the guy has some sort of multiple sources of income where he doesn't need anything at all to support himself and his family, then that would have been possible but you rarely see people like that. Because most of them don't want to get involve and get some stone to hit their head when things are not right in the crypto market. Only those who see the good opportunity it brings and when the price is going well, they surely put some in the market to further expand their mining power or invest in something that would make their life even better.