A somewhat similar concept costs from $800k aboard The World:
Home on the High Seas—WSJ Mansion - WSJ
but it's more like a permanent residence on a cruise ship:
Our Home - Live Aboard The World, Available Residences, Cruise Ship Apartments
I briefly looked into the "The World" concept out of curiosity, and it was sky-high pricing, as expected. It started off as a private development, where 1-bedroom rooms (albeit, LARGE 1 bedroom, for a cruise ship) ran about $800k in the early 2000s. Then they ran into financial trouble, and had to start doing temporary stays to get cash coming in. Residents paying millions were pissed, so they got together and had to pony up huge additional sums per person to buyout the developer so it would be an exclusive ship. Annual dues are (I think) maybe $30k for a 1 bedroom unit. And that's just for bare staff - that doesn't fund a reserve fund to replace the engines/generators/whatever else needs to be overhauled every 10-20 years!
When I read the topic, I first thought it was going to be about "The World" ship, but surprised to see another stab at it, with a far worse concept.
Without any propulsion, how do you get to this floating insanity out towards the middle of the Pacific/Atlantic/Indian oceans? Pay some unknown amount for someone in a 3rd world country to airlift you in a helicopter (if within a full tank distance), or wait 10 days for a crummy, dirty ship to come out to pick you up and spend several days to take you back to shore, at some random location on its travel path, then travel a day to the nearest international airport, to then pay insanely high last-minute tickets to get you back to wherever you want to go to? People pay extremely high prices for first-class flights, but I don't see them paying the same costs (or more!) for getting transportation service from some local yahoo outfit with a dirty freighter or some oil tanker to take them out to the middle of the ocean for even higher sums.
The World concept has very high fees, but I can only imagine what this would cost when you add in insurance, since it's a new concept, and a disaster waiting to happen! Not to mention the various costs to get on and off.
And with the "no power" thing, I'd imagine they would utilize some solar arrays, so don't know what they plan on doing when they get 3 cloudy days at sea. In a storm. (LOL - imagine trying to walk around this floating thing in 20-50 ft seas in the dark because there is no power). I know there are ways to harness the thermal incline in the ocean to produce electricity, but I can't see it producing enough power for the refrigerators/freezers to keep the food safely cold, and cooking the food, along with all of the other bare minimum requirements, in addition to providing all of the other electricity needs on the ship.
You could always go with a nuclear option for power (if permissible by whatever nation it is flagged under) - but I doubt those wearing the green shaded glasses would consider that.