I was given an exit row last year for free. Didn't ask, they just gave me the seat. I was Bronze at the time.
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The difference I was referring to was the policy. When I asked for an exit row seat last year in Singapore for SIN-MEL, I was told that the policy was you had to pay the $80 or whatever, the only possible freebie exit row seat was a window seat, which on a 744, doesn't offer much - typically cold, always cramped by the the exit door. I don't think it's any better than an ordinary seat.
In the conversation I had in Singapore, it sounded like Qantas were being quite ruthless in policing their policy. I opted not to pay and sat for 8 hours jammed into a seat somewhere in the middle of the cabin. When the person at the front of the cabin reclined their seat, everyone behind them in that column did the same, not by choice, it was the only sensible thing to do. It was quite amusing to watch, not so amusing to be part of it.
Asiana to my knowledge has no such policy (yet) of charging.
And it's interesting there's a huge difference on Qantas between an exit row seat and a ordinary Y class seat. Qantas can charge a $80 premium per international sector for the "privilege" of sitting in the exit row because their ordinary Y seats are so miserable.
On Asiana, and any of the other airlines with 34" pitch, the exit row seat is a bit better, but not all that much. I didn't mind at all sitting in a aisle Y class seat for 10 hours from Seoul to LA, for instance, no problem. It was a lot easier flight than my 8 hour SIN-MEL flight last year on QF.
I had been a silver Qantas FF for 9 or 10 years, and a Qantas Club member for nearly all that time. Letting go of my Qantas Club membership when it expired this year was easy after that incident ... Qantas are entitled to ask for extra money, but it's a great reminder that there are other choices, and better ones for my money.