Originally Posted by
fumje
Ah I misunderstood the question (thought "24 hours" was referring to the post-reservation window).
....
On second read, you could be right. If the OP is referring to the 24 hour post purchase time window, there is no need for GG BUYUP(that was what threw me plus the fact of referring to the waitlist). and no change fee .
If the post purchase timeframe is the 24 hour being reffered to, then the upfaring will improve the second sort item, fare class but other than perhaps getting out of the W fare logjam, the value of upfaing is questionable. This strategy really only has value if you are on the bubble - the last to make it vs the first not to make it. The rest of the time it is wasted money.