Torges also weighed in on the off-center aspect, his opinion was similar to Pat's. I persoanlly haven't seen where a bow that tracked a little to one side, ever broke or deteriorated at a rate in excess of normal. Maybe if you shot one bow every day, all day for years.
I don't lay out a bow to purposely get a string to trak closer to one side. But it seems that as often as not, this is the way they turn out. Gary Davis recommends making same-length limbs for this reason, so that you can orient your bow for center-shot after the tillering is done. It might not be quite as professional to do it this way, but it is certainly a practical way to go about it.
Guess I'm just naturally slightly warped.