Generally, I feel the value is $0. It may be different for others of course, but that's my marketplace because I haven't received the value of a GPU. I've been 0/6 this year in being able to use it, and like last year, will probably have to resort to using a GPU as an RPU to avoid expiration.

Personally, I think a lot of it depends on the route you are willing to fly. Also, don't forget, there is the value of the difference between a deeply discounted Y ticket vs. having to buy a W fare or above.