I don't know if anyone has noticed this...but there appears to be big difference in standing trade in values for Amps.
When I looked today the Quills were offering 11,000 standing vs. Vox Solaris 5,000 standing. Meanwhile Quill blueprint cost per segment is 2000 standing vs. Vox Solaris 3000 standing. This would translate into loss for trading in Vox Solaris crafted amps vs. the Quills.
I don't know if these values change with standing in each group or not.