YES! There are many, but most do not perform in all market conditions.
A few, however, do perform 24/5, and are made well-enough to be fully automatic (my golly-gosh, who woulda thought?)
But seriously, there is an exceptional one or two EA out there that for sure, are not usually available to the general public. And these babies produce serious profits (I'm talking over 100%+ per month). Very rare to find a person using this - even rarer to obtain a copy yourself.
I think those EAs are kept closely by the programmers themselves to ensure performance is maintained.