Susie, I think using NAS for "statement" items is generally a good idea, based on what it happening now. I did get the current adjustment on the Haute Hippie dress but it was only a $25 difference, and if I hadn't gotten it, I would have been fine. It was a statement piece purchase on major discount at NAS and missing out on $25 would not have bothered me.
On the other hand, there may be certain functional items that we know are NAS items that apparently do not get marked down afterward -- like the Natori Feathers bra and panties that I bought at NAS. Definitely worth it, and not marked down at this time.
BTW, I do understand when they won't honor the discount now for items that are not available, like the tops you have where they no longer have that color. It stinks, but to me it makes sense. I think you should hold onto the color that you love, even the one that you still paid the NAS price for.