Originally Posted by
oliver2002
Upgrading with miles is a bad idea in general, as you noticed you get more bang for the buck using them for awards straight away.
the advantage of upgrading with miles vs outright buying an award ticket is you can earn miles again. Often the Y fare is almost the same price as the taxes/fees on an award flight. Upgrade and award ticket are very similar in mileage, too.(56k vs 50k for NOAM). I think is worth it.