Are people actually here for Sistar? Like, do they have a concrete fanbase who stan them or is their music just liked by the public?
Their fanbase is basically the same size as Secret, After School, 4minute, miss A, Girl's Day... but the public lives for them, so the fanbase size really doesn't matter.
Groups with a more mature/sexy concept tend to have a smaller fanbase than groups that do aegyo and have the "girl next door" image. Female fans just don't relate and probably feel jealous of those attractive women that's why they constantly get **** shamed. It doesn't determine popularity and who's the bigger group though.