Yes it does sound rather attractive.
I don't know Phuket so well, but I would not consider a business in BKK or Pattaya without a Thai partner of some sort. It is their country, and too many people make the mistake of thinking they can walk in and clean up. Marry a Thai and you have insurance against the various laws they will discover to make life a bitch unless you keep paying bribes (not to mention the loyalty of 'staff' to any squashyface over a Westerner.) The same goes for several developing world countries, and I've seen a number of sad stories first hand.
The other thing you need is a Thai lawyer to check and complete the deal of course . . . No reason to think the guy's a scammer but for that money you need it done right.