I think a way to get a salary in this job is to manage a hedge fund of, oh, say a modest $50million or so. Take the mandatory 2% management fee to pay overhead, staff and, oh, your own meager salary of say $250K a year. Then simply string that along as long as it will last (survivor bias) and, heh presto, you've making a mint with OPM. Best of all, when you make a quarterly profit you get to take an extra 20% off the top and stuff it in your (and your partner's) back pockets and you don't have to pay it back the next quarter when you lose it all back - that's the best deal out there going.
Myself, I'd rather trade my own account, avoid all the hassel of clients, and pay myself based on performance - you get the good with the bad.
Viewing trading as a means to earn a regular salary does not work IMHO unless you either run a fund or work for somebody who does.