Experimental philosophers often seem to ignore or downplay the significance of demographic variation in philosophically relevant judgments. This article confirms this impression, discusses why demographic research is overlooked in experimental philosophy, and argues that variation is philosophically significant.Following the groundbreaking research by Jonathan Weinberg, Shaun Nichols, and Steve Stich (2001), part of experimental philosophy has endeavored to assess how much philosophical judgments vary across cultures, languages, religions, generations, age groups, genders, or socioeconomic groups (a research tradition that I will call "comparative experimental philosophy"). 1 Recent large-scale projects such as the Geography of Philosophy Project have extended comparative experimental philosophy in a more systematic direction (Kiper et al. 2022). This project, generously funded by the John Templeton Foundation, has been examining since 2017 how people understand three concepts of philosophical interest, viz. the concepts of knowledge, understanding, and wisdom, across cultures, religions, and languages using a variety of empirical methods: qualitative interviews, computational text analyses of large linguistic corpora in many languages, experimental studies using verbal and visual stimuli, and experimental paradigms drawn from experimental economics. 2 The results of the Geography of Philosophy Project and, more broadly, of the research tradition started by Weinberg et al. (2001) are naturally relevant for psychology and anthropology, 3 but their philosophical relevance might not seem obvious: why does it matter for philosophy if judgments of philosophical interest such as those about beauty, fairness, and love vary? The goal of this article is to offer a response to this question.Here is how I will proceed. In Section 1, I examine why the study of variation has been relatively neglected: I examine various plausible causes, and I also assess whether they justify this neglect. In Section 2, I review the 1 This goal is sometimes put in terms of concepts instead of, or in addition to, judgments, the goal being then to assess how much concepts vary. 2 More information can be found on the project's webpage: www.geographyofphilosophy.com and on its YouTube's channel: www.youtube.com/@geographyofphilosophyproje9275. 3 That said, anthropologists might have some concerns with the meaningfulness of asking philosophical questions to lay people across cultures (see, e.g., Clark Barrett in the following video: www.youtube.com/watch?v=xxMFDZ__MXY).