Quote from illiquid:
My not-so-profound point is that there is no edge in just rate differentials, that is all. If you can call the "turns" in a timely manner, why bother with a few pips a week in carry when you can just outright trade the pair in either direction. There is no "free money" from a carry trade, as the differential may have likely already been discounted by others who have entered the trade before you. The added volatility to the downside upon their exiting the trade can more than make up for the interest.
The practical bottom line is: the few pips a week just aren't worth it, if they color your objectivity in evaluating a given currency. There are often good reasons why certain currencies pay out what they do (check out Icelandic Krona lately), so don't let the clang of loose change deposited "daily" into your account distract you from all the opportunities available out there. Just me .02.