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This happens not "BECAUSE the gold is there", it is because there are dissimilar metals present. Your posts suggest this is something specific to the use of gold. Dissimilar metals tend to be present because there are differing structural requirements.
But yes, I always imagined water-proofing of e-readers was intended for accidental dunking rather than taking your scuba diving instructions for a swim. If you are not leaving the device soaking in an electrolytic solution the problem of preferential corrosion is minimal - your other points of dust and grit etc. are much more likely to cause a problem.
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