I think it is more about University application, but personal fulfilment also. There is a great deal of kudos in some schools to be given a leadership role and House Captain is fairly near the top of the tree. DD1 did not find it overly time consuming but she boarded so meetings with Housemistress, other girls, organising events, teams etc took place outside lesson and prep time. The House Captain, for one year, took the major role in bringing ideas and views of the girls in the house to the attention of the Housemistress as well as helping to organise the rehearsals, and take an active part in, House Music, House Drama, House Chapel, House Dinner, House Outing and Sports competitions (House Cheerleading Competition!!) etc . She enjoyed the role immensely and it does make DC's understand the concept of team work and leadership together with honing persuasion skills to get other people motivated to join in and organisational skills are sharpened too. I think it contributes to a well rounded person who has not just been an exam machine. DD1 took it seriously but some schools would not expect House Captains to do as much as DD did, but she really had a great year and exams did not suffer either because she learnt to do all her work effectively and be a committed House Captain as well. Not sure of the value of a weekly House Captain - this may be more ceremonial and not require much time.