What are the personal benefits?
What personal benefits do you get from marking?
There are definite CPD opportunities available to you from this additional experience. Certainly you can offer training sessions to teachers within your own department because, theoretically, you are the expert in that particular paper. The experience can also lead to other opportunities within the school because you show an ability and expertise that perhaps senior management might not otherwise have a chance to see.
When I applied for the post of Head of Department, the interview questions were very much focused around outputs, results and performance improvement. I was also asked a question about managing people. In answering these questions I relied heavily on my experience of marking and managing markers, as I worked as supervising examiner for two examination series', managing a team of 15 markers. The experience I gained with the awarding organisation definitely helped me to progress within the school.