Previous research reports that people organized into newly formed, arbitrary groups (i.e., minimal groups) areon averagein-group biased. However, that people onaveragebehave in a certain way does not imply thatmostpeople behave that way. Here, I report four studies (n = 224) demonstrating in-group biasedaveragebehaviors driven by a minority of about 30% participants. Further, only 14% reported allocating resources in a group-biased manner because they favored the in-group. I investigate and discuss how methodological issues related to non-normally distributed data, not taking participants' intentions into account, and using fixed response matrices can lead to overestimations of how widespread in-group bias is in minimal groups.