a bit of each
I would venture to say that it is mostly a looks thing, however, as you observed, the overall track is a bit wider with the spacers. Some might argue that the slight change in suspension geometry is not as much of a 'negative' as the addeded track width is a 'positive'.
As for your recitation about the spacers being 5mm - while those are likely the most popular, and the least likely to cause any adverse effects, significantly larger spacers are available.
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2003 Boxster S - Speed Yellow
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