I met a fairly well travelled bunch of people this past weekend for a coffee in Mumbai, and I was very surprised at the end of this conversation when we pulled out our wallets to pick the tab. The payment was split between two of the folks, and I was not allowed to pay. However, both the cards used for payment were not mileage earning or anything close!
The scene was repeated later that evening with a bunch of friends. Someone beat me to reaching out for the check, and another non-mileage earning credit card went into the payment mode.
For more info @ http://www.airlinecreditcards101.com