they didn't finish college but they spent quite some time there, i think they all benefited from their experiences of college life and they would've never got such experience if they had never been there. a certificate might be the least important thing one gets from the college imho
people do learn alot from life experience and college life makes a valuable part of that experience, so how can you say you have learned more from life experience than those who spent more years in school than you? studying in college doesn't forbid you to learn from your life i think, instead it expands and diversifies your life so you can actually learn more from it by attending college imho