For fins the maintenance is seals every 3 years (Naiad) so it is not a big cost. I just leave them on all the time so that wakes are a non-issue. I've become very used to the boat sitting flat, almost zero roll, when cruising.
For SK, I'm yet to see any reliable numbers for maintenance intervals and cost. But there are a few rumbling noises around the yards about "those little details" and in a number of boats the SK's are coming out as the owners are unhappy with that. If anyone has been having serious conversations with SK I'd be interested in what they say about the maintenance aspect when pushed (and push hard is probably what you will have to do to get an answer).
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Brian
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