<p>@Catria I don’t think anyone’s arguing that lower stats kids or kids with less knowledge about or less ambition towards college admissions wouldn’t benefit just as much if not moreso from these websites. But that wasn’t your question. Your question was why do these websites tend to attract better students, and that’s probably because of self selection. Students who don’t care as much about school or college or who don’t think about the admissions process as much are less likely to know about websites like this and are much less likely to post on them.</p>