Okay, imagine yourself being 2nd in class. There is only ONE person who outperformed you in the entire lecture hall. What are the chances of locating him and copying his answers, AND the possibility of your copied solution actually is a better answer than yours?
That's why I don't cheat. There's are like 215 people who are worse than me, and I don't wannt freaking jeopardize my grade by picking the wrong guy to copy.
If it's some funky elective like "Ancient Egyptian Literature 375", then maybe I could use some help. But I'd rather prove String Theory.