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?
As you were even tell, the expenses for this mining activity is quite massive up to the point that you need a really big chunk of money for your mining investment. Many miners mine just to have a certain coin then sell it for their expenses. Unless you have a good career outside mining, you can't sustain the electricity power demand for your mining. Another expenses is your maintenance for your rigs.