I hadnt heard of an alumni association, don't know if one exsists or not.
The award (at all levels) is a certificate and a badge. Bronze and silver are normally presented at a local event, gold is presented at a local event and also at the palace. There is a long waiting list for the palace presentation though! There are several reasons why I did all three levels, as has been said, there is a lower age limit for age level, so at 14 I could only start bronze. If you don't do bronze then you have to carry each section out longer for silver, and the same for gold. For another point of view, as I said earlier unis, employers etc seem to be impressed when someone has carried something out over a long period of time. Having all three shows that you are committed, and that it wasnt just a whim starting one of the levels when you were pushed into it at school/college etc. Also, I did all three because I enjoyed them, I wouldnt do something that I hated, but I enjoyed bronze, so did silver, enjoyed that so did gold. It just seemed logical to me to carry on doing something that I enjoyed.