As an owner of an island camp (ie unfinished seasonal cottage) who bought on an island because the waterfront was so much less expensive than on the mainland, I think we would have uses for almost all of those services, but of course it would depend on what it costs. We use WIS to open/close the camp, and do what we can ourselves. When we do need to have work done, it is pricey to get someone out there.
I don't know how much volume you would need, and assume islands close together would work better than scattered all over the lake.
My kids loved it when the ice cream boat used to come, so we would buy ice cream mostly because he boated past and it was fun for them, but I doubt that was a solid revenue source!
As an aside - we love living on the island, and are glad that the finances pushed us in that direction!
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