Why robots?
Becauserobots.org
sorry I had to post the link to my site because the thread name was just too good
To answer your question though, I think the biggest limiting factor for me as a student and a mentor is the lack of time needed to do more than just one thig. If I were to go out and participate in several competitions, which I have done with FIRST and Botball, it is just hectic to try and dedicate yourself fully to either competition.