Honestly, most laces shouldn't be breaking unless you're rubbing the edges of your board on it.
I don't know about that.
I snapped off the cord on a pair of Burton Moto's and a pair of the SL9's in the store. Brand new out of the box.
I didn't think I was really pulling on them either. All I could think of was "I'm screwed if this happens at the hill because there's no way I could ever thread an ordinary shoelace into the boot"