Obviously thinking about a few dollars for a single outlet in a home environment is one thing, but think about a marina.
Each boat can have two 30 amp shore power outlets. So a place like MVYC has 300 boats, thats an 18,000 amp GFI. So maybe they don't have one big one but 600 small ones, a 30 amp GFI is $150 plus labor. That's $90,000 in parts alone. Even still all the feeds to the breaker panels are vulnerable.
I'd rather just not swim at the marina than trust that they will spend all this money and didn't screw something up.
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