If you follow the points and miles hobby for a few months, you will easily notice this trend: First, a good offer, deal or loophole comes up. People flock to the new opportunity and then one way or another it is gone. I can think of many instances, like getting 50% of your points back with the Amex business platinum, getting your Southwest companion pass transferring points from Marriott, flying roundtrip business class to Europe for under 37,000 miles. The Chase Sapphire Reserve’s 100,000 signup bonus. I’m sure there are many other examples.
That’s why when I hear about a good deal, I try to take advantage before it’s history! In the case of flight deals, you usually get 24 hours to change your mind. In most other instances, you pull the trigger and hope the deal really is as good as it seems. There have been times when I have thought I missed out on a great deal and a better one comes around weeks or months later.