You're both right, of course!
While it is possible to be very profitable with a very poor win : loss ratio, psychologically it's a very tough gig. My guess is that most traders would struggle to implement a trading strategy successfully that has a worse win : loss ratio than 50%. Not being able to better a random coin toss has gotta mess with your head! I'm sure such traders exist, but they're a rare breed, not least because success with such a strategy requires the trader to be very good at two things:
1. cutting losses quickly, and . . .
2. letting the winners run.
Anyone who's been trading for a while is probably quite good at the first, but relatively few traders ever really master the second.
None of this is fact, it's just my belief based upon reading forums like this one - so I could be very wide of the mark!
Face value in this game...does the concept actually exist on a public forum? "My only income is derived from trading", it's not about believing this statement, it's about what lies behind it, i'll explain. My wife has a well paid job and i sit at home all day averaging £100 a week, it's my only income, i'm a pro trader.
I can twist the facts to suit myself, it's a public forum.
It's not hard to make a few quid trading.