Be very wary of the prices. You may be best just get the last minute upgrade when you check-in, they're regularly cheaper.
I've done it a handful of times, always bid the lowest amount, and received it around 80% of the time (Mostly flights from YYC to YYZ/YUL/YOW). Usually around $100 per hour of flight time is considered reasonable from what I've read on other boards.
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