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Actually, rather than earthing specifically (Ethernet interfaces have isolation transformers so earth loops "Should" not happen) for me it is more the idea of electrical isolation, there is no chance of any fault current if there is no conductor.
Plus, I work with fibre connections day in day out for a job, if I can put in a fibre based link for a reasonable cost you wont see me running copper! There is more cost in the pit and pipe and excavator hire than there is in the fibre and associated equipment, let alone the incremental cost difference between a CAT6 link and a fibre one.
Nearly done with the pit and pipe work, I have just come in from installing a 2 pit outside the shed which gives me flexibility later to run another link out to the planned obs or to a new shed that is on the long term plan (Ten years!) without having to break into the conduit. Dig down the pit wall, pop in another 50mm penetration and put the pipe up to it, bang a spigot on the end, haul cable!
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