erikpascal,
How could they have paid "a fraction of my ticket price" if they also paid Y same as you? You also state you are Prem Ex. Do you know what level they all were? Sounds like all you are out is 13k miles for that return upgrade. 13k miles for a confirmed upgrade is a small price to pay rather than taking a chance you won't get upgraded at all. I don't think you are entitled to your miles back.
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Happy travelling and remember - No matter where you go, there you are.
[This message has been edited by Baze (edited 09-10-1999).]