I drink diet coke in every breakfast at every hotel I stayed at ever since I stopped drinking coffee. I just a little bit of caffeine to start the morning. The only time I have been charged for the diet coke was in Hong Kong. I just paid for it but it was probably the most expansive can of soda I have paid.. I think it was $80 HK.. which is like $10 US LOL. But I figure I get the breakfasts free which was about $40 US per person... I could pay for the the overpriced can of coke.