9,943 € for ETIHAD vs 745 € for Apple
For a One-Way-Ticket from Dusseldorf (GER) to Bangkok (THA) with stopover in Abu Dhabi you have to pay about 513 € (571 US$). The total flight time for 10,000 km (6214 miles) is 12h 35min.
To get the iPhone 6S 16GB as an ETIHAD Airways Reward you have to fly 120,435 miles which is 193,821 km or 19.3821 flights from DUS via AUH to BKK. So the total costs for tickets is about 9,943 € (11,070 US$) and the price of an iPhone 6S 16 GB is 745 € (829 US$) in the German Apple Store.
Not included is the labor costs of your working time when flying 244 h out of office hours.
As a direct consequence of this calculation you should buy at the Apple Store and enjoy the spicy food in Thailand during holidays.
More about flights on your iPhone …