Damselfish:
If you read the description
http://www.fourseasons.com/maldiveskh/four_seasons_explorer/a_typical_day_on_the_four_seasons_explorer.html
the 4 Seasons "liveaboard" is not a dive liveaboard but more like a small cruiseship with a little diving that is incidental to cruising and other activities. They schedule only 2 dives per day 1 early morning and 1 late afternoon, and who knows if their priority is to get to the best places. (The afternoon dive is "Afternoon dive and Discover Scuba Diving (DSD) course for beginners" which could rather limit site selection. It would be cool to get a group and take over the whole boat and force a real dive schedule, assuming they have knowledge of the better sites and the capability to dive them.
Yeah, I noticed this. But that doesn't detract from the Four Seasons as a liveaboard dive boat, it's just the typical European way. French Polynesia is similar. A lot of the resorts have onsite dive shops with their own boats, but they only offer a single tank morning trip and a single tank afternoon trip. When we stayed at the Moorea Intercontinental, for example, we ended up using an outside dive shop that offered a 2-tank trip. If we could only convince those lazy Europeans to dive more and sun less we'd have a lot more luxury dive resorts to choose from.
The Kia Ora hotel in Rangiroa has an excellent dive shop, even renting Draegers and Inspirations. A couple dives a day on a rebreather would be equivalent to four a day on scuba, so perhaps that hotel should count even if the Four Seasons Explorer does not.
I don't think there are many or any high end resorts that are really "dedicated dive resorts" I doubt the numbers work. But there are certainly plenty of options out there where the diving should be good and convienient enough. If a place is not a dedicated dive resort I think one key is whether shlepping through a place dripping and looking like a drowned rat while carting gear would feel normal, and how far you have to go.
I think the best compromise is a luxury hotel with an on-site shop, but that often means compromising on the number of dives a day (usually just two) and the quality of the dive operation (which usually caters to the lowest common denominator, the recently certified inexperienced diver, since experienced divers usually know better and don't dive with the onsite resort). I dove with ScubaDu at the Presidente Cozumel once when Aldora canceled on us at the last minute. They had a briefing that actually included showing the divers how to use their BC power inflators. A first dive to 80' limited to 25 minutes, then a max 35 minute shallower dive, and we had to pay $80 for the privilege (vs. the $60 which is far more common for 2-tank dives in Coz). Decent hotel, but hardly a dive resort.
There are some really nice places on Provo (Turks and Caicos) though for most places there it's a ride to the boat. You might look into the Amanyara. They have a dive op on site but no idea what's they're like. Write up a trip report.
Sure, starting at $1,000/night during hurricane season. I didn't find the diving at Northwest Point to be all that, at least in comparison to the far better stuff at French Cay when we did the Aggressor. For a $1,000 a night dive resort I'd want to be sitting on a much healthier reef.