My family owns a few luxury apartments in Santorini.
We always have them overstaffed. The apartments are 80% full during all seasons and 100% March to November.
The revenue is exceptional.
Our clients are quite happy I'd say, judging by reviews in tripadvisor, booking etc (9.5 booking, 4.5 tripadvisor).
Even during times that electricity is cut off and there is no water due having an electric pump to bring water up the cliff.
Its a win win scenario. We get a few customers that are on their honeymoon etc, meaning they are paying way above their actual price range, and they are always happy with the things provided.
Even on unfortunate moments like 2013 I think where half of the island was out of power for 4 days so thats 4 days without water, electricity on a 2000+ euros a night trip, I'd say customers were pretty understanding of the situation and also they were glad we did everything we could to accommodate their needs such as giving them ton's of bottled water etc.
The point am trying to make here is that people that are willing to pay for a luxury apartment are usually nice enough and understanding when there is an issue, and the ones that can't really afford it but its their big moment in their lifes, appreciate things like "bed/mattress" etc luxuries that they never had before.
Btw people living on our apartments will pay 100euro taxis and 600 euro boat trips... (way overpriced compared to general market prices) and generally they will spend a lot more money than just accommodation