If you are one of those pen turners that replace the original ink with the Easy flo 9000 . What do you do with the "NEW" originals. they have now become secondary., and no good in the sale of the pen?.
I have a bag full sitting in my parts box. I give them to my son. He goes through refills amazingly fast taking notes at school, but even that doesn't come close to using them all up.
When I do craft shows, etc. I have a few on the table to give to customers that may want them. I tell them this is the standard refill, your pen has an upgrade.
Personally I just save them at this point. At some point I might offer them for sale in my store as replacements. Not everybody wants to pay the price for Schmidts.