But people on here tell me all those government departments are good things <| sep |> Why is this band so good though <| sep |> have the maroon colorway , so nice <| sep |> They joy of West Coast casual . We were sold on the idea of wearing jeans and polar fleece anywhere , and it turns out in reality no one ever has a clue what ' s appropriate to wear . Especially when there are East Coasters my mother around . <| sep |> I think there are more than 2 , 800 people in the wizarding community of the British Isles , and that that number is based on an underestimation of the size of the student body at hogwarts . I can see how that figure was worked out ten students in Harry ' s year in gryffindor , times four , times seven , but it assumes that that starting number of ten is both accurate and representative of all houses in all years . It may be , but the information we have isn ' t enough to support that assumption . JK Rowling puts the number of students at hogwarts at a thousand , which would just about push the total wizarding population to close to the ten thousand threshold of viability your source suggests . On that threshold , it seems to me that Smith whoever that is is referring to a closed community that doesn ' t receive any injections of fresh genetic material I ' m aware of how rude that sounds , which isn ' t the case for the wizarding community which benefits from muggle borns and half blood children introducing genetic variety from a much larger population on a regular basis , meaning that the ten thousand threshold , even if its true for a closed community , doesn ' t apply to wizards .