Originally Posted by irabk

That is a personal choice, depending on what routes you fly and how many awards you have. If you mostly fly $79 routes, and are sitting on a ton of awards, with some soon to expire, and more in the pipeline, a $59 fare looks better than spending $50 to reissue it down the road. On the other hand, if you fly $159-$219 routes, and only have a couple, with few in the pipeline, a $109 fare looks wasted.

On average, the value of a one way flight on an award is $150, give or take.