Some trades I make that are long term (this one and AUD/NZD comes to mind) I don't use a very large percent of my margin. I can afford to sit and wait, and frankly I don't mind adding to my position.
Have you seen the RSI for the USD/CAD? It's hilarious This is yet another example of the market pushing the envelope as far as it can go. As soon as it realizes the greed stampede is over, it'll reverse. And the more severe it pushes it, the more severe reverse will occur.
While I agree that long term the CAD is higher (because long term the USD is lower against anything), I do laugh at those calling for PAR on the USD/CAD position. They're the same people who yelled Euro at 1.50 by this year, late last December.