Can't wait?
Ok, here's the thing. I make reservation for 2000 points. When it comes time, I use the trick. So, it becomes 1,400 points. Let's compare:
1. I don't use the trick. I am out, 2000 points our course.
2. I do use the trick, I have 600 points in holding, and, am out 1,400 points. Let's say somehow I never get to use those 600, unlikely. What am I out? 2,000 points, same as #1, worst case! Best case, I get something, maybe an extension to a stay.
So, not sure why you would not. Nothing to lose, stuff to gain.