Ok, thanks for the explanation, I get what you're saying now. I've never taken a really close look at that angle of a wheel before, but I had always thought that the wheel was basically centered over the hub with the spokes on both sides pretty much evenly angled. It never occurred to me that you could/ should move it off center. Wouldn't it better, if necessary, to shift the hub on the axle in order to get the wheel centered? (And then add spacers to both sides if needed. ) I would think that having the spokes at different angles wouldn't be as secure.
I did notice that too, that the axle looks bent in the pic, but I think it's just the angle, I don't think it's actually bent.