The badges of the Anti-Toad Alliance became an instant hit upon release, especially since they were distributed free of charge to alliance members. Many students who detested Umbridge, upon learning that purchasing one would cost a Galleon, rushed over to the Weasley twins to grab a badge and pin it to their chests.
As for needing a signature to get a badge, that proved to be no obstacle at all. Most members of the Anti-Toad Alliance were actually members of the Defense Association, meaning they had already signed their names once before, and the signature merely granted badge-holders a ten percent discount on purchases.
For a time, it became all the rage for Hogwarts students to wear such badges on their chests, making it easy to identify each other's houses and affiliations.
Chapter 985