The different responses are interesting. First time this happened it was a hugely expensive ticket. (Opera at Glyndeboune no less.) Something I would never have booked, not in a million years. Not an opera fan, but agreed to drive my friend. I could not have afforded to pay then, and said friend said she didn't expect me to, and said "don't ask!" When I wondered how much it cost. I think her friend had paid for it. 2nd time, different friend was let down by anotger friend, and this time it was presented as a gift, as was so .last minute... Another very expensive seat (ballet). I did offer to pay, but again it was declined.