Just recently had a friend lost on ETH long, he did made a lot of money from trading, he did lose a lot of money from trading as well. Things are not that clear black/white in the real world, just because you think that things will do fine, you are not going to get that. Sometimes you get good results, sometimes you get terrible results, you are not going to be all that enticing when you are dealing with all of this. I personally believe that we should consider professional traders as humans just like all of us and not put them on some pedestal above everyone else, they are good, but of course they make mistakes as well.