The point of customizing is exactly that. You get a great bonus but for a restriction.
I customize all the main weapons of my chars. For example, my warriors FDS, my monks Forgotten staff, my eles galigords. Only one customized weapon per char seems fine. If, however, I had a rare skin (fellblade, etc) and I wanted to show it off on all my chars I would leave it uncustomized becuase I don't own it for it's stats, just the look.
Right
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