In some occasions it happened to me too so I understand the frustration.
But on the other hand.... It is acceptable cause I am sure it are always the same who are first on the list.
We are well informed because we spent way too much time on this passion.
So in most of the cases we know these things much faster than 99,99% of the people who might be interested too.
So it would be too easy to get all the desired pieces because we were first on the list.
Somethimes the AD or boutique must consider other criteria