My first inclination here is “No way”, when I travel whether it is on business or privately, I hate to have to pay extra for Wi-Fi. Most hotels have free Wi-Fi in the lobby and you can work there very easily, and quite often nobody expect you to buy anything although I will happily buy a drink for the privilege. But if you are a guest in the hotel clearly Wi-Fi is like having a TV or hairdryer in the room and should not be charged. Yes I will choose a hotel on the basis of free Wi-Fi not only in the lobby but also in the room, (it is not a deal-breaker – but certainly a big influence).
In most cafes, pubs and resto you get free Wi-Fi. I find it perfectly OK that you might have to buy your drinks, and ask for the code – or you get it for free if you can sit through a minute of commercials. On public transportation in Copenhagen amongst other cities you have free WI-FI. And although I initially was “Wow – cool” I am now merely shrugging and thinking “Of Course…”. So it is a complete mystery to me why you would not have free Wi-Fi in airports? (Except of course I realize it is a captured audience and because of that "easy money" - but it is not good service!)When do you think it is OK to pay for Wi-Fi – if ever?