That's really the problem. Sure, its cheap and they have great financial aid, but they don't pay for the tutors and the "life changing" experiences in Africa the rich kids have.
This just ain't reality. Most kids don't get in because they took a trip to Africa. Parents that pay a ton of money on making their kids the perfect college applicant generally get a bad deal and are a small minority.
It's not about paying to pad the application. There are legit methods of expanding your kid's world/mind. Those method generally cost more money than sitting in the house all summer watching tv.
Poor kids may not have a house to sit in and watch tv all day. They are at a major disadvantage and Ivies and other elite schools don't do a good job incorporating them into their schools due to their low sat scores and poor educational training, which is due to their poor socioeconomic status. You speak as if everyone is privileged and have the same opportunities but lazy.
And when everyone does those exact same things, nobody stands out (unless you lack those activities, in which case you are hurt). Look at what a high school degree has become... or what a bachelors is becoming. Truly standing out takes money and/or rare opportunity.