He said "more exciting" at the beginning of your quote. And if the 14-year-olds somehow don't already want to be rich, how is Paul Graham telling them how to do it going to teach them that it is the most important thing?
Many people seem to survive 7 hours of advice on how to write properly, solve math problems, and understand history and science for 175 days a year over 12 of their most impressionable years without thinking any of those things are important. That doesn't give me a lot of cause for alarm over a 15 minute Paul Graham talk