Ahha, an exception to the rule! There are a few, but the majority seem to be one or the other. And that doesn't mean people are really good at one thing, and really bad at the other, but significantly better at one over the other.

And yes, you're absolutely right, it does help to have that interest, although I maintain that spelling is something that isn't easy to learn (at least, for me). English spelling just makes so little sense.