It's similar as betting into the garbage coin with the ration 80% chance to be the shitcoin and the rest to be the legit coins. Way too risky and you have probability to loose all your money in a sudden. I am never going to do this.
80% 
I think the chances of winning on shitcoin mining may be a failure 99% of the time.
All the coins that I mined and waited for their growth in the future turned out to be a scam or bad projects.
Therefore, most miners prefer the most profitable coins today.