Originally Posted by
CPRich
The sunk cost of the original fare is not relevant in the decision. The advantages of a business class seat, and the $1000 cost of it, don't change based on the original ticket price.
I think it is. Imagine, at the time of booking, that you have the choice between $1,000 Y fare from SFO to LHR or a J fare for $3,000. You decide against booking the more expensive J fare. Fast forward to the week prior to departure. The airline offers you an upgrade offer $1,200 each way. That's not a good deal, it's paying $400 over what you originally thought to be too expensive. If however you're original fare was $300, then it is a much better deal...