I'm a small miner. I currently mine ETH & Decred. I keep 50% of what I mine and sell 50% as a hedge and to buy mining equipment. Right now I mine just a little decred because there's no gui wallet/staking.  When there is one in the near future I'll mine more.  Since it is a stake coin I'll hold 75% & sell 25% after a non-cmd line gui is released.

I'm installing the dual miner to see how it does. Mining a little more decred won't cause me to change how I currently buy & sell.  But those that have no interest in eth might just sell their eth to buy more decred.