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Hard to say but to me West Marine is to far. Yes internet is easy and most often less expensive (watch for shipping). But when I need something I go to my local outlets, within a 15 mile radius. When I had a slipped boat I always bought local where I was. Not inexpensive but worth it is I could spend more time on/with the boat.
It might be a viable business if current set up can show traffic through the store.
Over the 55 plus years of boating, building, repairing, restoring, boats I can honestly say I bought my Marine supplies 85% from the local marine chandeliers. But I'm probably different than most as I'm not on Facebook either every day.