In my experience, startup founders who want to get rich want it more in order to have the freedom to work on what they want than to impress people. That could be because we prefer startups whose founders include hackers. On the other hand, we don't just prefer that type because they're more fun to hang around with, but because in our opinion they're more likely to succeed.
She is saying that ideas are powerful, and internalizing the wrong ones can cause damage.
I recently saw pg give an interview wherein he discussed how much more Y Combinator focuses on who the founders are rather than what the idea is. This is a great start, and I think there is a lot of fertile ground that can really be developed into a powerful message that will reach many young people.