I have a long CAD/JPY play that I've been playing for a little over 3 months. It's usually a small position that I hold for less than a week, but it has been very profitable nevertheless. I have not been paying too much attention to the interest being paid, but I was doing a little quick math its a little more than I thought. I'll admit that when I trade ForEx, I paid little attention to risk/reward and just went more for intuition. Most of my trades are good... I just get burned royally when I try shorting strong currencies (i.e. CAD, GBP).