if a he trades 50% margin and he earn 100 times but the last time some extra-ordinary news released and market went wrong on his direction by 200 pips or he had a wrong trade that lost 200 pips then he will blow his account by 101th time. I think his account may not super large so he trade 50% because he doesnt really care if he really lose all the money, but after he has a larger account, he may not trade 50%..
Dislikedget to know the aud/cad extensively...then understand the usd/cad and the aud/usd and you will know what I mean. Then that risk isnt really that risky. .Ignored
we will never know the market and we can never control the price the only thing we can 100% control is our risk.