Well you can divide it save some for future use. Although we have problems with the volatility of the coins but as time goes by certainly when usage goes up value will certainly go up moattet what. So its better to hold some.
I agree, you can put some of it in your wallet or saving account for future purposes. I think also it will depend on the coin that you are mining. When you see that the price was profitable enough then think for it to sell your coin because it may fall again if you didnt grab that opportunity.