You know what, I never found out where the industry statistic came from so can only share some of my experience.
When I first started trading, I was with an IB rather than a direct market maker. After became good friends with the guys at the dealing desk, one of them revealed to me that out of the hundreds of accounts they have trading with them, less than 10 were profitable. So, back then, this static stuck in my mind.
Maybe it's just the general observations over the years leading up to this #. But fact is, doesn't matter if it's 90% or 99%, as long as others can do it, you should be able to as well. Look on the bright side, at least it ain't impossible.
