Originally Posted by agjil

From my experience, the difference between the cheapest non-upgradable fare and upgradable fare was more than $1000, as you said.
You need to basically buy a full-fare economy ticket to be able to upgrade using miles, hence the difference is so large.
The cheapest discounted economy tickets are usually more than 50% discounted from the full-fare price.
This makes me think upgrading using miles is not the best use of miles...I'd be curious to know what others think/have experienced.