Expect to hear one complaint,there's not enough of it this time\" from a buyer when offerred mature roots from well handled collections.
Folks digging in a hurry and cutting up the root and digging small imature roots, breaking the fibers and necks off and just wearing the roots out should expect to get resistence from the buyers.
Also a growing concern to buyers are \" Redroots\". Roots dug in red clay ground or under Pines can have a much lower value and it is suggested that these be immediatley transplanted into darker black loam maybe say under a walnut tree etc. and left over 2 or 3 growing seasons before selling. Move the seeds to healthy dark well drained soil as well but try to stay as close to the location of the parental stock as you can without planting into the red clay soil. Washing in bleach or scrubbing these roots to remove the clay will not work well and only damage and devalue them further. If you have no other choice just handle them as you would normal wild roots sale them at market value 30-50% of top price and be gratefull you found them at all.