I think you touch the most important point here. I'm one of the main people who manage GSoC for KDE. KDE is the biggest org taking part in GSoC this year in terms of number of students mentored. In addition we are running our own program (Season of KDE) next to it. So in total I'd say we've mentored about 100 students through these programs this year alone. We didn't get there by accident. You know what the main benefit of GSoC is in my opinion? Getting an organisation into the mindset of mentoring - into the mindset of "yes we need to train new people because they can do awesome things even if they screw up sometimes on the way there".
+1000. I <3 that way of thinking and I'd very much like our community to have the same attitude towards GSoC. We're a community working towards education of the world. Participating in GSoC as a mentoring organization is a right fit.
- Ryan