I think more often than not the majority of parents cant afford 5-7k for a summer experience for a few weeks. While sports at school generally cost money its not anywhere near that much and keeps kids busy for an entire semester. The parents spending huge sums of money for sports travel camps in my opinion is no different than the expensive summer college programs. I am personally in the camp if you want to volunteer and that is your passion, there is so much need in our backyards there is no need to travel overseas to do that, hence why it may not impress them. Each adcom is going to have their own thoughts on the matter based on the school in which they represent and their own personal biases. My personal thought is to spend your summer being a kid - working a summer job, hanging out at the pool with some friends and relax.