IMO you could afford to build high tech self sustaining enviroment for <50k people easily, a few micro nuclear reactors [1] would provide enough electricity, hydroponics, seafood farming, or advanced things like protein from bacteria/algae protein for food production, import the luxuries. They seem to have drinkable fresh water source, and with enough power and cash desalination is viable.
The fantasy business model would be to be rich enough to be able to personally cover these costs and establish a high tech R&D environment :) I'm not suggesting that this is actually possible, it's one of those things - what would I do if I had Bill Gates kind of money.