Sarah,
I wish this was true, but there has to be another reason. The first item of the treasury actually sold yesterday, and I was thrilled that I might have helped to do that (then again, it might have nothing to do with my treasury; not that many people have viewed it so far) but anyway, that item is still in there.
So the question remains, is this a technical 'fluke'?
One of my items was removed from a treasury a few weeks back, after the curator had notified me I was in it, and I had thanked her in a comment, and I was a little taken aback then. Now I wonder, can this just happen once in a while, without anyone doing anything?