This research examines whether consumer cynicism about collective buying depends on consumers’ observations of fellow buyers being treated unfairly in a cobuying context. Prosocial consumers should differ from proself consumers in their level of cynicism, because they value equality in outcomes. Study 1 reveals that prosocials become cynical if others receive an unfair outcome and therefore do not repatronize the provider. This effect does not occur for proselfs. Study 2 shows that mood mediates this effect. Specifically, when prosocial consumers are in a positive mood, the others’ outcomes no longer influence their cynicism. © 2012 Wiley Periodicals, Inc.