I'd only recommend making this transfer if you already had a bunch of miles Thai miles for whatever reason and just needed to top off your account for an award. (pointsmilesandmore.com)
Still this promotion is best just for topping off your account with a redemption in mind in my opinion. (dannydealguru.com)
This is when topping off your account by buying miles can make a lot of sense. (upgradedpoints.com)