Funny you should ask because I've been wondering why they aren't.
I thought the birds would eat any millet seeds they could find.
That particular plant has been cut away from the fuchsia it was planted with for quite some time now, but I have another. It's yellowed now, the seeds are dry, and they're beginning to drop. I really enjoyed it, but it needs a larger area than I provided for it. It does very well in a container, but any other plants in with it are seriously dwarfed...it just looks odd. Next time I think I'll let them stand alone.