Of course this is a risk whether you sell or not, but in the end some currencies will be described as garbage and they will lose value, I hope you will not choose one of them
another thing to consider before start mining alts better to understand the road map and the significance of certain project whether if there's a real
uses along the way, holding those that have a great future and adn a good back up dev will assure us to gain much bigger profits while holding our rewards
but the risk still there that we select project that will turned into scam and haven't got any value at the end.
Bitcoin is the better in the investing process and enabling the mining. It will give more profit mining is the best way to process the internet. Mining is the better the best way to get more income. Mining I save the bitcoin for the future investing process and I get more information to the mining. Mining is helping to future business processes