Appallingly low compensation. $1500HKD? Seriously? That's not even the fare difference between subclasses within PEY let alone the difference between PEY and J. It seems like an outright scam even though the ticket was redeemed.

I think quoting the fare difference is a good way to make it clear what's fair.

Just putting this out there based on a couple of anecdotes. I've been offered about $10,000HKD before when asked if I'd be willing to volunteer for a downgrade from J to PEY. All on flights between HKG/YYZ.