We have a resident charm of goldfinches in our garden of about 20-30 strong all the time (we share then with the neighbors gardens obviously...) and have had nyger seeds in a feeder for most of last year but absolutely no luck in charming then down to the feeder unfortunately.
jdp
rhb
Our garden is charmless. I did have a Nyjer seed feeder for a while but still no takers.
Sods law there'll be a goldfinch in the camera stills when I go through them in a bit.