[joemi]

Loss of selling privileges can be a big problem too, and incredibly hard to fight.

The store I work for once lost selling privileges for spurious copyright claims regarding books we had bought directly from large established publishers. Even with the publishers themselves (and sometimes the authors, too) writing on our behalf to state that there were no violations, it still took about two weeks to regain privileges. During a busy season, two weeks is a long time to be without profits for a small retailer.